Diagnose Motor Failure

What happens here

Returning to the sawmill, the creator removes a protective cover plate from the motor housing. He explains that the visible drive motor is responsible for moving the sawhead along the track. Upon inspection, he points out significant corrosion and visible water/sludge inside the motor housing, confirming that water ingress is the cause of the failure. He expresses surprise, noting that the sawmill, a Wood-Mizer LT40, is designed for outdoor use.

Goal: Determine the exact cause of the motor's malfunction