I disconnect the quick connects and join the hoses together, there will be some fluid loss but not much. I keep a bucket handy to catch any loss. Make sure that there is no pressure in the control valve. If yours is like mine I do not think I would mess with the pressure relief valve with out getting all of the possible information before hand. Mine is adjustable and not sure what has to be done to remove mine but if the factory adjustments are changed, I do not know how to reset it to where it should be. Not sure if you have contacted the dealer and talked to their repair guy but this is a good place to start if all else fails. I do it all the time and if they can't help, they tell me who to call to get the information I need.
Good luck.
Farwell