I'm making progress. Tonight I am going to solder the wire connections on my zipper flippers. I'll have to look for clear photos to help. I removed the zipper mechanism and disassembled it some, but I didn't take it to a bench to clean. I got a lot of gunk off of it and the left side had a washer thing that was pretty loose. So it is a little tighter now and cleaner.
The machine will start a game and go through 5 balls. I had a playfield 10 point switch that was closed that was causing the 00-90 stepper unit coil to lock on. So that is fixed. The rollovers on the ramp are not working and all 3 pop bumpers are illuminated all the time. So I guess I have a stuck relay or switch for the ramp roll overs.
Also the kickback lane ball save thing on the left won't stay lit. The coil and switch work if I keep the kickback button held down, so that's cool.
The Odin kickout hole isn't working right. It only releases when the release fire gods captive ball switch is hit. Maybe the problem is the mushroom bumper for Odin or a relay?
The strobing lights for the Odin hole value rotate, so that's fun.
The gate at the bottom of the Wotan kickout lane seems to work.
So it's super fun and exciting to see the machine come to life. Hopefully after I solder up the zipper flippers, it will be tinkering with some switch adjustments and relay cleaning.