Has the board had the capacitors changed?
Have you tried altering the pots? Round black discs that move left to right. If unsure can you post a pic of the board?
Have you tried removing the board from the backbox? Let it hang. I have mine isolated as grounding it causes noise issues.
Yesterday I noticed my Sorcerer making various unwanted noises whilst in attract mode, removed the board from the mounting studs, so isolating the board from the ground plane and much better.