My Tracer back up lights on one the driver side keeps shorting out.

SO......the other day my service advisor brings back a repair order and a part for a car......I ask him for the key."oh , the customer's got it" and then I asked him where's the customer?........ "oh.......They're not here"...........I'll never understand why people go to a circus for entertainment , when we have so much just at our jobs!!........let's see if we get a reply????