My new Shadow has had more headaches than any other purchase to date ugh. But was playing a game and it reset. I turned it off and on and it sound Grounded Row 1. I pulled up the switch test and almost every switch was locked on. When I pulled out the MPU, U20 was in 4 separate pieces and was melted to the socket. I pulled the socket out and replaced it and a new U20 chip. I also noticed R72 was fried. So I followed R72 down to J207 and it was connected to Pin 6 which is Column 6 on the Switch matrix. I followed the wire to all the switches and I did not notice any loose wires on the switches or any nearby solenoids. I also looked at any solenoid tabs, GI tabs, and lots of other things.
Any other suggestions on what to look for?