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If the Level Legs are programmed correctly when activated they will dump the air from the air bags to lower the coach. If the air is leaking out of the bags by just shutting down the engine, then you have an issue outside of the Level Legs.
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