U slučaju da je zapisnik pogrešan, tražite ispravku.

U slučaju da is a fixed expression meaning in case or if / in the event that.

So:

• u slučaju = in the case / in the event
• da introduces the following clause

In this sentence, U slučaju da je zapisnik pogrešan means If the record/report is incorrect or In case the record/report is incorrect.

This phrase is a bit more formal than simple ako.

Je is the 3rd person singular present tense of biti (to be).

So:

• zapisnik je pogrešan = the record is incorrect

When that becomes part of the conditional expression, you get:

• u slučaju da je zapisnik pogrešan = if the record is incorrect

So da is just introducing the clause, and je is the normal verb is.

Yes. You could say:

• Ako je zapisnik pogrešan, tražite ispravku.

That would mean almost the same thing: If the record is incorrect, request a correction.

The difference is mostly in tone:

• ako = the normal everyday word for if
• u slučaju da = more formal, bureaucratic, or instructional, like in the event that

Since zapisnik and ispravka are themselves fairly formal words, u slučaju da fits the style well.

Zapisnik usually means an official written record, such as:

• minutes of a meeting
• a report
• a record made by an official person
• sometimes a statement record or protocol record, depending on context

It is a masculine noun.

In this sentence, it is the subject of the clause:

• zapisnik je pogrešan = the record is incorrect

Because pogrešan is an adjective, and it has to agree with zapisnik.

Since zapisnik is:

• masculine
• singular
• nominative

the adjective is also:

• pogrešan = masculine singular nominative

Compare:

• pogrešan zapisnik = incorrect record
• pogrešna prijava = incorrect application
• pogrešno ime = incorrect name

So the ending changes to match the noun.

Here it is functioning as an imperative: request.

Formally, tražite can look the same as:

• 2nd person plural present = you (plural) are requesting / request
• 2nd person plural imperative = request!
• and it is also used as a polite singular command, like French vous or German polite Sie

In this sentence, the meaning is clearly instructional, so it is best understood as:

• tražite ispravku = request a correction

It can mean either:

• command to several people, or
• polite instruction to one person

Because ispravku is in the accusative singular.

The basic noun is:

• ispravka = correction (nominative singular)

But tražiti (to request / seek / ask for) takes a direct object, and that object goes in the accusative:

• tražiti ispravku = to request a correction

So:

• nominative: ispravka
• accusative: ispravku

This is a very common pattern with feminine nouns ending in -a.

You could say zatražite ispravku, and that would also be very natural.

The difference is mainly aspect:

• tražiti = imperfective
• zatražiti = perfective

Very roughly:

• tražite ispravku = request a correction / ask for a correction
• zatražite ispravku = make/request the correction once, as a completed action

In instructions, both are possible.
Zatražite can sound a bit more pointed or one-time, while tražite is slightly more general. In administrative language, both are common.

The comma separates the conditional clause from the main clause:

• U slučaju da je zapisnik pogrešan, = conditional part
• tražite ispravku. = main instruction

In Serbian, when a subordinate clause comes first, it is normally separated by a comma.

So the punctuation works much like in English:

• If the record is incorrect, request a correction.

Yes, very much so.

Several things make it formal or administrative:

• u slučaju da instead of plain ako
• zapisnik is an official-type noun
• ispravka is also formal/administrative vocabulary
• tražite is phrased like an instruction in a document, office, or procedure

This is the kind of sentence you might see:

• on a form
• in official instructions
• in legal or administrative text
• in customer-service guidance

The sentence starts with the condition and then gives the instruction:

• U slučaju da je zapisnik pogrešan, tražite ispravku.

This is the most natural order for an instruction of this type.

You could rearrange it, but the original sounds the most standard and formal. For example:

• Tražite ispravku u slučaju da je zapisnik pogrešan.

This is still understandable, but it sounds a little less like a typical official instruction and slightly more like neutral statement word order.

So the original order is preferred in formal writing.