The pyramid is now fixed!
So I reassembled everything and played a test game. The pyramid worked correctly. There were four flaky light sockets which would work if you wiggled the light bulb in them but over time would quit working. So I replaced those from my spare wiring harness.
The slam switch was wired wrong, fixed.
The pendulum tilt switch was not wired, fixed.
During my test game, the VUKs would not kick the ball up correctly. The ball would hit the bottom of the ball guide and bounce down back into the VUK. I adjusted the left VUK and it works correctly now. The right VUK still doesn't kick the ball out about half the time.
The left slingshot kicker sometimes kicks two or three times when a ball hits one of the two switches on it. I've adjusted that switch multiple times, but eventually it still goes back to the semi-machine gunning. It may be time to replace that switch.
The Sarcophagus has an unusual semi-rollover switch. The ball shouldn't roll all the way over the switch, the end of the switch sticks up in the air instead of going back under the playfield. If the switch is not bent at the correct angle, the ball will either roll over the switch, causing it to be blocked between the sarcophagus kicker and the switch, or else will rest against the switch out of range of the kicker. So I've been trying to get that wire bent at exactly the right angle.
Waxing the playfield may have been a mistake. There is wax in some of the hard to reach areas now which will be difficult to get out. My mirror glazed pinballs have wax on them now which makes them not perfectly round. I have two sets of those pinballs, so once the wax is cleaned up I'll use those.
The biggest problem with the machine now is the playfield GI. I was hoping the problem was just the fuse, but the fuse is good. The "T" relay which can also cause the GI to fail is also good. Today I'm going to do some more testing.