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Then missing motor power supply. On motor connector J/P767 should be power supply. Between pin1 and pin2 should be 24V.
I think you wrote wrong LED status, or something measured incorrectly.
Something wrong with processor relay pcb, or application. Check where you have 24V and where have not :
24V on J/P654 ( between pin 1 and pin 6 ) , or between TP2 ( ground ) and TP1 ( 24V ) . LED14 on processor relay pcb should be light.
24V should be between ground and fuse F53 ( on both sides )
24V should be between ground and J/P648 pin 1
24V should be between ground and J/P648 pin 4 ( when dryer cover interlock switch activated ) . When have this voltage - LED10 is light and relay X8 activated.
24V should be between ground and J/P659 pin 1
24V should be between ground and J/P649 pin 4 ( when processor cover interlock switch activated ) . When have this voltage, relay X8 is on, processor drive is ON ( software output check ) then LED11 should be light and relay X5 activated.
If LED11 light and relay X5 activated then should be 24V on J/P658 pin 1. It is connected to motor connector ( J/P767 pin 1 ) .
Check all again. Then you can see where 24V disappear.
Take QSS3501F PLUS or Fuji LP7100 service manual. There is circuit diagram where can see all connections.
Preheating is turned off but the heater is working and I can turn it on manually. That's a good point but I don't think that is related to the issue I am having with the drive motor though. I am going to fix the drive motor problem first and then try that.
I think LED10 has voltage, but LED is faulty. It is not a problem. LED is just to see relay status.
LED11 is light ( relay X5 is ON ) ONLY when LED10 has voltage ( relay X8 is ON ) .
Motor connector J/P767 is power supply. Do you have 24V there ( between pin1 and pin2 ) ? If yes then power supply circuit works ( power supply, fuse, interlock switches, X5, X8 and other ) .
On motor connector J/P780 are control signals. This connector connected with J/P702 ( connector on processor control pcb ) . It is other board ( pcb with ARCNET ) - not processor relay pcb.