They are not known to leak but anything is possible. I would get up on the roof an inspect it. The cap itself is screwed on and the screws holes are caulked in. Dig the caulk out and remove the screws and cap. Then inspect the base that is mounted to the roof for possible areas of leakage. Seal anything found with dicor caulk. Re install the cap and caulk the screw holes. If the cap is cracked or not in good shape, it should be replaced.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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