In the repair industry, Road Map, or Schemo was what I heard for wiring diagrams or service literature. Gary, your diagnostic skills are more than OK. You know basic troubleshooting if not moderate troubleshooting just fine. Seeburgs aren't always the easiest to work on. They can be complex. You tackled a Tough Dog, and got it running from a basket case, I respect skills like this.
And sometimes, you can get a jukebox which is possessed from new. And never gets sorted out for many years. Case in point. A AMI-Rowe MM-1 which was hexed from new. Ran a day or two, repaired, put back on the route, did this 4 more times. Then put in the warehouse (Don't pull parts from this machine, unreliable from new). I got this given to me for parts from a routeman friend, it got trucked to one of the transmitter sites. Mint condition, low use. Cleaned it, lubricated the mechanism and recapped the amplifier, and selection receiver. Worked a day or two, then sound vanished.
So, armed with the repair manual, and a parts amplifier (which I got working fine without incident) audio got restored. Occasionally wanted to blow a main fuse. Delved deeper inside, and checked wiring against schematics. Wound up with 18 unsoldered connections, two shorted connections which had to be repaired, and a bad rectifier tube. The worst problem was the original amplifier, how it passed QC, nobody knows. Soldered a lot of connections which never were properly, some bad resistors way out of tolerance, a new rectifier tube, and never ever gave me issues. Plays as fine as you could want. And that's been for 5 years at that. Had to have been a Friday last shift machine.