Soldering
#2
It's pretty easy to do the soldering itself but it took me a few tries to not lift the old copper pads on pretty much all of the boards so I went through a lot of equipment. The HVAC bulbs are by far the hardest to do. I think I went through four systems before I finally got them all working properly without destroying the board because it was so old and brittle. The door lights get pretty tricky with the door lock lights having two boards sitting on top of each other with the light in the middle. A bit of a pain in the ***.