Luckily storms rolled in today and the temp stayed in the 70s. The technician came around 4. There was a wire with a split casing and everything was really dusty. He thinks debris fell against the wire. He fixed the wire and told us what we needed to clean it. Much better than replacing anything. I got the feeling he thought I over reacted to the noise and smell, but we live in a trailer and I've seen what happens when one catches fire.
I drank a lot of coffee this morning and all the floors are now clean. I'm going to make fajitas and take a shower.