So my Gorgar started acting funny and randomly give out free credits. Also, the C didn't light up when the ball rolls over it, but then goes on the same time as the free credit is awarded. In trying to find the problem, I noticed that if I swing/tap the coin door it tend to trigger the free credit. I checked for wires touching things they shouldn't be, but couldn't find the culprit. Any ideas or tips? I took video, but it doesn't look like I can upload video here.

Thanks, I will look inside the harnesses. It does it with coin door closed, and when open, but when open if I swing the coin door or tap it, the free game knocker tends to fire.

I can't remember if I tried while playfield was risen. I will try that to see if it is something from playfield hitting metal on cab.

Thanks