.. Getting a fuse

In the basement. Open the fusebox.

But the wires are hot! You need to protect yourself to remove a fuse. Use protective clothing. You will find extra piece of clothing somewhere.

Unclog the basin in room 7. Use the string panties on the opened fusebox to get a fuse.

Yeah, you only take one fuse. It should help you in other tasks, too. What other rooms where you dealing with?

During Saturday morning you are dealing with rooms 1, 12, and 13.

Go to the roof and talk to Jonny. You learn that you should cut the power in room 13. After you have talked to Jonny you can take the fuse out.