You never did mention what you did with that red hot circuit breaker. You said you pulled it out, but then what? I had a similar issue on my Caprice, but it was the circuit breaker for the rear window defogger. Mine got so hot it melted my skin when I tried to grab it. I replaced it, and when i use the rear defogger repeatedly, it fries once in a while, and I replace it again. On the inside, there is a set of contacts, and there is a thin hair-like wire that looks like it slightly shorts the contacts, but it wraps around one of the contact'* metal arm. (this looks like a bi-metal, I think) I believe this heats up , and trips the contacts several minutes later, or something, but when my circuit breaker was hot, that hair-like wire was burned through. This would keep the contacts closed , which would keep constant power going through them, which explains the heat, and the dead battery.

This doesn't mean you don't have a short, but there'* a chance, if you didn't replace the circuit breaker. There is a chance someone or something was setting on your seat switch and drawing a constant load.... Just some thoughts....

check the fuse box to see if there is a separate relay (silver plug)for the power seats.....check which other options are on the same circuit....and all the wires for breaks or tears....

Don't know why I didn't think of it before.

When you pull the fuse/breaker out, if the pins are anything but clean metal, replace it. Could be corrosion on the contacts heating you up.

I've begun a strict policy on my car since I realize there are contact issues. Any electrical item I take apart gets looked over for heat/burn marks. When reassembly occurs I use a little dielectric grease/compound on all connections. The dielectric is specifically designed to keep corrosion from happening. Nice big tube of dielectric grease from Napa/Advance/Autozone $5, not having to wonder if corrosion is going to visit the same connector again....Priceless.