Take me to school.......

A customer has contacted me about brakes dragging on a D6T S#WHF00364. I know NOTHING about these. From the sounds of what they are saying it may be leakage or a flow problem. Works great for a hour or 2 in the morning, then they start dragging the machine down. SO...…..Ive got my thinking cap on and ready to learn.
No active codes that Im aware of. I wont be seeing this machine for a few days so I have a bit of time to study.

Take me to school.......