What was found
(CAN) DURING THE WING BOLT INSPECTION, THE LT LOWER AFT BATHTUB FITTING WAS FOUND TO HAVE CHAFE MARK FROM CONTACT WITH THE CLIP ON THE WING FITTING COVER. ONE MARK EXTENDED INTO THE FITTING RADIUS. MFG WAS CONSULTED AND SENT OUT A FIELD REPAIR TO REMOVE THE DAMAGE. EACH BATHTUB FITTING COVER IS HELD IN PLACE BY A SPRING STEEL CLIP THAT GRIPS THE WING FITTING AT ONE END WHILE THE OTHER END IS HELD IN PLACE BY A SCREW. IT APPEARS THAT THE COVER MAY HAVE BEEN A LITTLE LOOSE ALLOWING IT TO FLUTTER OR VIBRATE AND CAUSING THE CLIP TO CHAFE THE WING FITTING.