Tl* the contact owns a 2011 ford f-350. the contact stated that the interior lighting failed to operate while he was inside the vehicle or when the doors were open. the vehicle was taken to tyler ford (2626 s sw loop 323, tyler, tx 75701, (800) 788-7876) to be diagnosed, but the cause of the failure could not be determined. the vehicle was not repaired and the failure recurred multiple times. the vehicle was taken to an independent mechanic where it was diagnosed, but the cause of the failure could not be determined. the contact referenced nhtsa campaign number: 11v128000 (electrical system). the manufacturer was made aware of the failure and informed the contact that the vin was not included in a recall. the failure mileage was approximately 105,000.