From your description it sounds like the prior owner of the machine was the one who paid to have the guy go through the game. Did that occur at your house or at his and was it moved after it was inspected?

Give the guy some time. As others have said it's not your heating or your plumbing or your transportation, it's a toy.(and a very expensive one at that). As a fellow pinball tech I can tell you that things get very busy this time of year (actually it's been busy the entire year!!). It's also late on Friday and I would give him until Monday late afternoon to get back to you.

Interested in finding out what the issue turns out to be.On TZ's I won't mess with old clock boards, replace them with new boards or you are just wasting time and money. From your description however it sounds like a motor drive issue (the aux driver board) If it was moved and the head was lowered I would check out the ground cable on the upper right corner of the large driver board. Or make sure none of the connectors on the aux driver board just above it are loose.