Was the bridge rectifier (DB1) tested? My Baywatch and Maverick both had DMD resets during gameplay (both have the service bulletin cable). Game continues to play, CPU info would be displayed during the reset before showing the scores again and sometimes the music would be silent and only the sound effects played until the next ball or a mode triggered music again.

In each case, DB1 was the culprit.

Oh, if the cable fixed the issue, then don't do anything else. The BR does have large tab lugs and it's a fairly simple replacement since no other components are nearby to be careful of.

I work from home and am standing 10' away from Baywatch. So here's your pic.

Silver square under the heat sink is the bridge rectifier at DB1.

I've had to replace the BR on a few Sega pins due to DMD resets. I've noticed that when it's bad, it gets noticeably hot to the touch after keeping your finger on it a few seconds. Compared to the BR that's on the board below this, which runs cool, mildy warm to the touch. Certainly take the board out to test the BR, but if it's hot I bet it will test bad.

20190313_101028 (resized).jpg