Hi! Our Metallica (Pro) premium is having an ongoing issue. The coffin will light and creak like the Newton block has been triggered when it has not. Also, a random ball will launch for no reason here and there while another is in play. I have temporarily repaired this before, only for it to keep happening a few days later.
This game was purchased from it's original owner, who did not know how to get the balls out besides shaking the playfield to death. I think this is part of the issue. I have hot glued a few connectors under the playfield to prevent them from falling out, as the clips are broken on a few. I have been successful with preventing this issue for a while by cleaning the optos and plugging/replugging connections on the boards under the PF that have anything to do with the coffin. Any other suggestions are welcome! I have scoured the web. Thank you.

Nope! They did once, but I reglued them. Pins look good, boards look good. Trying to avoid replacing everything. Maybe it will help if I attach some pics. I'm not sure why the clips are broken off, honestly, unless Mr Shakey pulled the connectors out for some reason.

I am assuming cleaning the optos in both the coffin and the trough are helping with the extra ball issue. Maybe it is the wiring, however? It just launches a single ball. The game does not end if a ball drains, and once in a while it even offers a ball save if you drain one. It's a nice ghost, anyways.

Thank you!

So, if this helps anyone, I ended up getting new boards from Stern and the problem seems to be corrected. Opto board 2 and 3.