Usually what will tear a seal other than catching it on some object is the cabinet door jamb gets something spilled on it and it become sticky and can act as a glue tearing the gasket. Recommend it is kept clean and once a year use a thin film of petroleum jelly to lubricate and preserve the gasket.
When you say on top, does this mean away from the mating surface? Also are you the original owner of the coach? If so it is probably covered under warranty unless it is obvious accidental occurrence. Could you take a photo and post it?
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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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