The manual was very accurate for the part that I was changing, I was able to order the correct part and had no issues with the replacement procedure. However, I was expecting to have more detailed repairs for the lower drive unit.
Text excerpt from page 9 (click to view)
MC-B250
6.4. 6.5.
Motor U Switch
1. Pull out the motor U from the lower body U. Remove solder from the lead wires and take out the motor.
1. Pull out the switch and the switch fitting plate from the lower body U. 2. As the picture shows, insert a minus screwdriver, etc. in the clearance between the fitting plate and the switch. Lift and remove the switch. 3. Remove solder from the switch.