Error code 000051 - Canon imageRUNNER 3300 All-In-One Laser Printer

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From service manual E051-0000 At start-up, home position is not detected when the horizontal registration assembly is moved 100 mm in the direction of home position.
Main cause The horizontal home position sensor is faulty. The horizontal registration motor is faulty. The DC controller PCB is faulty.
Action
1. Connector
Are the connectors of the horizontal registration home position sensor and the horizontal registration motor connected?
a. DC controller PCB (J304) <-> relay connector <-> horizontal registration home position sensor
b. DC controller PCB (J304) <-> relay connector <-> horizontal registration motor
NO: Connect the connectors.
2. Sensor lever (damage and interference), Sensor
Is abnormal noise heard from the horizontal registration assembly in keeping with the motor rotation?
YES: a. The horizontal registration assembly is out of place because of
damage to the sensor lever. Replace the sensor lever.
b. The horizontal registration assembly malfunctions because of the
presence of foreign matter. Remove the foreign matter.
c. The sensor is faulty and cannot detect home position. Replace the
sensor.
3. Horizontal registration motor, DC controller PCB
Is the horizontal registration motor control signal generated by the DC controller PCB?
J304-1/2: 24 V, J304-3/4/5/6: motor excitation signal
YES: The horizontal registration motor is faulty. Replace the motor.
NO: Replace the DC controller PCB. Usually E 051 is the horizonal motor problem, you can take out the pick up ***'y. On the motor have a small gear, sometime this gear broken.
Or the horizontal reg motor became stuck in the wrong position. I was able to manually move it back and rebooted copier. Not sure why the motor was in the wrong position-cust related?