Every once in a blue moon the sound goes REAL loud by itself and rebooting it sets it back to normal. It has a new CPU and all new ribbon cables. I swapped sound boards from a STTNG and swapped out all the sound roms and it still did it. Could it be the software or sound roms ? Something on the power driver board? I have an extra power driver board I can swap if that's a possibility. It's game rom is revision L-6 and sound is revision L-1. Desperate to fix this, TIA

I read something similar too but swapping the sound board should eliminate that as a possibility

Hmmm just found this , the new cpu is a rottendog:
http://rec.games.pinball.narkive.com/wZFNnBDZ/tech-rottendog-wpc-sound-issues-with-ij-and-sttng

Thanks, that looks like a Clive repair but again, I switched sound boards?

Found a bent leg out of the socket on the CPU, I was half asleep when I found it this morning but I think it was either the game rom of the chip below the game rom, it was one of the legs on the end of the chip. Wanted to report back for future searchers with this problem. Always remember to be careful when swapping IC's, easy to miss a leg and create hours of troubleshooting a problem you self created. I'll keep playing/testing but I'm praying that was it, thanks for the help.