I just picked up a clean 9090 from the original owner that was in protection mode. VU meters were only lights coming on. After checking the Sansui Forum FAQ, in 5 minutes, I was able to get my tuner dial and both tuner signal lights on by changing the red wire location. The posts also helped me diagnose the root cause of protection mode is from the driver board - removed it and flashing red changes to green light, out of protection! I got excited when I saw the fix for the 9090 DB board only involved changing the two outboard resistors, but this is not the case with the 9090 as there are many resistors here. I checked a few and they were out of spec or not providing even readings comparing left to right channel. I'm an amateur and don't want to F up my board, it's the later one with the fuses F2436-1. I can send pics. Does anyone here on the site work on the boards if I carefully packed it and mailed it to you? Thanks guys!