Try going into switch test and see if it registers when you put the drop target down. If not something is probably wrong with the optical switch ("opto") for the drop target - there is an infrared LED and receiver pair on the little board under the playfield. First thing to try would be cleaning these.

From pinrepair guide:
Cleaning Optos.
Optos can get dusty from the "black dust" inside a game. To clean an opto, use a Q-tip dipped in glass cleaner. Wipe the opto with the Windex-wet Q-tip, then dry the opto with a clean, dry Q-tip. Do NOT use canned air to blow optos clean! The air in these cans is too cold and can damage an opto.

Great! So glad you got your drop target working!

Unfortunately I don't think I will be much help with the Mystery Wheel problem - I am pretty new to working on pins too and (luckily) I haven't had any problems with my Mystery Wheel. I can't imagine why it would work fine in diagnostics but not during the game...but hopefully one of these Pinside experts will have some thoughts on that.

There is an opto positioning sensor for the mystery wheel as well. When you run the test does it display what segment of the wheel is passing or just spins the wheel?

viperrwk

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.

You didn't say earlier you'd replaced the MPU with a Rottendog (nice call orbian.)

Don't count on the problem being fixed any time soon. What happened to your original board? I'd try and get that fixed and back in the machine.

viperrwk

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.