My Bally Fathom has a stuck switch somewhere.  It is not the physical switch as it does not appear during the switch test and I checked them all anyway.  I've got it narrowed down to one of 5 switches.  I've noticed 2 or these switches are not even registering points when closed.  I'm starting to get lazy about the whole thing and am wondering whether I should focus on the switches themselves ( caps or diodes on the them ) or should I first start looking at the MPU /switch matrix.

Any help is appreciated.  Heck, if anybody wants to come over and fix it for me, that's okay too !!