Quoted from SharkDiver:
Hey gang, did thread search so if I missed an answer to this issue apologies. Ive got a premium Maiden and am having a weird issue with the sarcophagus lock misbehaving. The mechanism just rapidly lowers and raises constantly now during gameplay, eventually it comes to a stop in the fully lowered position. I should mention that previously I was having an issue with it with the sarcophagus ball not always registering a hit to light MUMMY. Had a service call done on it and the tech replaced a faulty part. Things seemed fine but now this raising/lowering is suddenly happening. Anyone else have something like this occur or thoughts on to what the issue may be?
Agree with @tranqilize that sounds like a problem with the switches inside of the sarcophagus mech.
I had that problem with my premium early on last year. Had made some posts about it, and others had made several posts about it as well. There are a few temporary maneuvers that can be made, but ultimately the answer is to partially disassemble that mech, remove the current micro switches with the metal angled arm, and exchange them for micro roller switches.
Per report, when the game was originally designed, it was designed with roller switches within that mechanism, although in production, they opted to use the angled switches, which have been known to cause the kind of troubles you're talking about.
It probably is that very first switch, however once I had my mech partially disassembled, I went ahead and changed all three of them within the sarcophagus mech and I had no problems afterwards...and all the funny behavior at/between the sarcophagus mech and mummy, etc, all went away and didn't return...it was a good day.
There are a few outfits to pick these switches up. Here's a link at Marco: