Hi pinballman3
Many simple relays have an so-called "Self-Hold-Switch" --- the QB- and the ZB-Relay in Your Control-Bank have (I call it) "Self-Cut-Switch": From one side of the coil runs a short wire to "switch mounted on the relay" - THIS is the switch to inspect - on QB- and ZB- the switch must open when the relay "plunges / drops". Drop of solder at the solder-lugs ? doghair crap of wire there ? An solderlug heavy bent ? Greetings Rolf

Hi pinballman3
HowardR shows in his post-3 "What makes the motor to run". First thing to do: In this snippet of schematics there are mentioned Relays and the "Self-Hold-Switch motor-1C" --- do You see one of the mentioned relays always pulling ? (((Poor us - a switch can be faulty closed when the relay is not pulling ... --- but hoping for luck - do You see one of the mentioned relays always pulling ?))) Greetings Rolf

Hi pinballman3
a problem in "posting after some days - and then the other person writes after some days": Hard to keep track on the subject ...
I studied Your post-10 - studied the schematics - and now comes a wild guess: You do have an problem (Score-Motor turning) - You may have more problems --- eventually You have one more problem "You want to start a game and accidentally the Player-Unit happens to be in Home-Position - and the "eventually problem" makes the U-Relay / Control-Bank-Reset-Coil fire.
Please read this post https://pinside.com/pinball/forum/topic/my-pioneer-went-crazy-and-i-m-not-far-behind#post-4474179 - unplug the main power cord - go to the backbox and do a lot of stepping - see the fifth cam lifts in one position its switchstack - the fifth cam lifts its switchstack in Home-Position. Then YOU manually do five steps (You leave Home-Position) - then plug-in, toggle-on, start a game - WHAT are U-Relay and Control-Bank-Reset-Coil do ? Greetings Rolf