My Haunted House can't seem to figure out where the ball is. Plays the wrong music on each of the three playfields, "drain ball" sounds when hitting targets... I suspected a switch problem, so I went through and tested each individually in the test menu. Incidentally I have a Ni-Wumpf board installed and for a couple I got a "Clean Switch" error. According to the manual this happens when more than one switch closes in a very short time frame. So with a contact cleaner I went though each and made sure the spacing was correct. This didn't solve the problem. Having recently experienced the problems bad or missing diodes can cause I decided to check each of the switch diodes. To my surprise I found three of them tested bad. They are associated with switches 00, 22 and 40, so across various rows and columns. This may sound like a crazy question, but is it plausible that all are in fact bad or could something else be causing them to test bad? Replacing them is easy, but I was surprised to find multiple testing bad. Thanks.