Der Hausmeister soll morgen die Sicherung austauschen, falls das Problem wieder auftaucht.

The caretaker is said to replace the fuse tomorrow, in case the problem occurs again.

Breakdown of Der Hausmeister soll morgen die Sicherung austauschen, falls das Problem wieder auftaucht.

• morgen: tomorrow
• wieder: again
• falls: in case
• das Problem: the problem

Questions & Answers about Der Hausmeister soll morgen die Sicherung austauschen, falls das Problem wieder auftaucht.

Why is soll used here, and what does it imply?

soll is the modal verb sollen. In this kind of sentence it often means is supposed to / is to / should in the sense of an instruction, plan, or expectation:

• Der Hausmeister soll ... = The caretaker/janitor is supposed to ...
  It can also sometimes report what someone else says (allegedly), but in this context (a task + time word morgen) it most naturally sounds like a work instruction/plan.

Why is the verb phrase split: soll ... austauschen?

German modal verbs push the “main action” verb into the infinitive at the end of the clause:

• soll = conjugated modal (2nd position in a main clause)
• austauschen = infinitive at the end
  So: Der Hausmeister soll morgen die Sicherung austauschen.

What case is der Hausmeister, and what case is die Sicherung?

• der Hausmeister is nominative (the subject doing the action).
• die Sicherung is accusative (the direct object being replaced).
  The verb austauschen typically takes an accusative object: etwas austauschen.