A few months ago I got my hands on a Firepower in pretty good physical shape but would not boot (powered up and the GI worked). The master display had some glitchy issues and 2 of the slave displays were shot. Sound test worked fine so I knew the sound and speech boards were in decent shape. Driver board was a mess, acid damage, fried resistors everywhere, interconnect was, well typically lousy.
I've done a decent amount of restoration work on this era of SS machine before but other than replacing a resistor or two my board work has been minimal.
So, since I got the machine for a great price I decided that spending the dough on some new boards was worth it. I picked up all new Rottendog boards, MPU combo board, power supply, and all new displays. I also installed LEDs, cleaned every socket and connector, replaced the GI cap, rebuilt the flippers & installed new coils, replaced a fried pop bumper coil, and re-sleeved every other coil on the machine, replaced the power cord, playfield rubber, and added lexan washers to protect the plastic.
After all of this work I'm super apprehensive that I may have done something wrong and it's all going up in a puff of smoke when I power it up. I plan on flipping the switch after a few final tweaks next weekend. If all goes well I'll be posting a few pics. This is by far the most work I have put into a pin but it has also been a ton of fun.