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Make certain all connections are clean and tight. It sounds like you may have an issue with the solenoid valves not opening the return flow of fluid. Verify voltage to these while retracting and let us know what you find.
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