My 2013 14.44-4OB expanda had both tail lights and one indicator light loose some of their leds when the van was around a year old. They sent me new replacements and I replaced the 3 faulty units and kept one indicator as a spare. The replacements were fine when we sold the van. The three that failed showed evidence of moisture in them. Maybe that's why they failed. From memory, they can run on a voltage from 10-30 vdc, so I doubt a high voltage would have damaged them. You could try Jayco to see if they will send you replacements. LED lights should last a very long time.
Out of curiosity have any of the running / marker lights failed?
Cheers
Nick