Do you need to place it in the attic? Where’s the breaker box that powers the outlet? I ask because I have a zigbee relay controlling the outlet for my washing machine, and another controlling the outlet for my garage heater, but neither are anywhere near what they control. I stuck them in junction boxes closer to the breakers in the basement.

They are talking about doing a full engine replacement.

As they should.

What do I do in this situation?

It sounds like they’re taking care of the problem. As long as they’re paying for the parts and work and reimbursing you for inconvenience (car rental?) then it seems like everything is under control and you don’t have to do anything.