The solenoid valve for that jack may have debris or worked loose. Make certain the valve is fully closed (clockwise). You can go to or files for diagnostic and service manuals http://www.irv2.com/forums/downloads.php?do=cat&id=15. Good luck and keep us posted.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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