Okay so Sunday night my Congo is playing, but I notice that instead of locking balls in volcano it is registering them, but then kicking it out instantly. I still get my lock but instead of a ball coming to shooter lane it comes back out of Volcano. I went to go into test mode and the my test buttons / direct switches weren't working, coin switches still worked. Planned to come back Monday with all my tools and fix it. I get there Monday night and game is still taking credits, but start button no longer works. Repin my direct switches connector at coin door interface board and this fixes my test buttons so I go into test mode. No switches in column 2 work at all. If I press any other switch on the playfield I get a row ground short error for the corresponding row (seems to happen to all 8 rows). Planned to swap out U20 tonight. Does this seem like the right path to be taking or am I likely looking at 10 opto board issue under the playfield?