Hello! Did you replace your MPU with one of the Rottendog MPUs? There is a known issue with this MPU. The Spook House drop target will not reset. If you knock it down it stays down. The opto never changes state. The same with the Mystery Wheel. It will spin sometimes but the corresponding award is not properly reflected in the display windows. They are working on fixing this.

Yes! The sounds can be missing or not correct for what should be heard for a specific action. I would let them know you are having this problem. This may be affecting other system 11 games using this board with opto switches. Also the Great Lakes Modular single drop target replacement board will correct the problem. However there is no replacement board for the Mystery Wheel that will fix the problem when using Rottendog board.

I would return the board and get a good original. They've known about this problem for about 18 months. I don't see it being resolved anytime soon. You might check with pinballpcb.com and see when their board will be ready.