Just picked up boat from marina where they did a service and the like. 50%
of way back I noticed that the bow thruster only worked pushing to port.
Unit is a Volvo with 4 batteries supporting the 24-volt supply. Service
marina indicates that failure is purely a coincidence! I realize it could be
a coiincidence, but I'd appreciate any thoughts on diagnostics and remedy.
[I'd really want to avoid hauling a 53' boat for $500 to find it is a
solenoid!]

Thoughts or opinion?

Dave