Are you sure the pump is the problem? Sounds more like the pump motor could be bad. Has he tried to retract/extend the slides manually? Can you hear the pump running? If not, it may just be a low battery. There is a good troubleshooting section at Equalizersystems.com. More information would be helpful.
If it is in fact the motor, it can be replaced without changing/draining the hydraulic fluid. No valves are affected either. If it's the pump, then yes, the fluid must be drained and lines bled.
To answer your question, there are no gotchas, as far as I know, concerning problems to be aware of. All motorhomes have failures. It's to be expected. I have not had any unusual or abnormal problems with my Presidio.
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Pablo77RV
'08 Mandalay Presidio 42B
#3469
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