I don't know if this is related to the sound problem I'm having, so I started another thread.
https://pinside.com/pinball/forum/topic/raven-no-sound
I was playing last night & I noticed that the helicopter starts up at times when it shouldn't. I think it's only supposed to start when you hit the spinner. I paid attention to it last night & it started when the ball went down the left inlane, hit a standup target, bounced around the pop bumpers... It didn't do it every time though. It's been doing this a while now but I didn't give it any thought. I'm not sure whether it started before the sound went out, after I did the ground mods, etc.
I have no idea where to start. Could there be a short somewhere?

Anybody have any ideas about this? I paid attention last night & the helicopter started on pretty well everything except when the spinner was hit. I think this a bigger problem than the lack of sound. Could I have done something to the MPU or maybe my ground mods crossed something?

Ah, never thought of that. I'll take a look. Although, it's only supposed to run when the spinner's hit & it doesn't.