Mine are partially burnt out too but I never use them. The switch is inconveniently placed and I've never really figured out any use for them. It would be pretty easy to buy a reel of waterproof LEDs on Ebay and replace them if you felt the need. I've thought about repurposing the circuit for a strip of LED's in the compartment.
2015 Crossroads Cruiser Aire CAF27RL, 2018 F250 diesel crewcab SRW 4WD short bed, Trailer Saver hitch with Reese adapter on Ford OEM underbed 5th wheel connector.