I found an interesting problem. I put a logic analyzer on U100 of the good SRS and it failed power on test 100% of the time. Sometimes it gave the same Offset 0 Err as my broken one, sometimes Offset g Err.
I had leads on pins 3,6,9-15 using a IC clip. Once I removed ONE logic analyzer lead from pin 13, it booted fine. Gently placed the wire on the IC clip pin, and it failed boot, off, passed, on and failed. I thought the IC clip was shorting pins, but I proved that wrong because all it took was the impedance of the wire to fail boot.
Also, i pulled the positive side of the battery to ground to reset the RAM and that didn’t solve anything.
In a precision post I said the 15 is 13.5, but realized I need to use circuit ground and not chassis.
On another note, U107 pins 1,2, and 3 should have +107mV on pin 1, and +49mV on 2 and 3. The broken SRS only has -11mV, -5mV, and -4mV respectively.