I was told you were the guru for HWH problems so here goes. Last use I retracted jacks(levelers) and frronts came right up. Took 15 seconds. Rears came 1/2 way up and stopped. Tried using floor jack to raise them and wouldn't budge. Had to crack lines at pump to release pressure and they came right up. Can power on system but can't extend or retract. Slide works fine off hyd system. Read manual and located fuse box velcroed to firewall but all fuses are ok. Any suggestions? 2000 Winnebago Adventurer 32V Triton V10