I'm needing some suggestions on how to fix my Magic Castle's sound board. Generally the board is working very well with nice loud clear tones but I'm missing about 1/3 of my sounds...primarily background sounds. I'm running a new Pinball Solutions 1B1165/Evo MPU (fantastic product) and have installed new ribbon cable to sound board. I've also replaced the AY3-8910 and both 6821PIA chips with new. I'm thinking of replacing the 3 EPROMs but they look to be freshly installed and labeled. Any ideas on what I could try next? Thanks.

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Thanks for the info. Just ordered a couple of MF10CN's. Fingers crossed!