What was found
UPON REMOVAL OF RT INBOARD LEADING EDGE FUEL CELL FOR REPAIRS OF A FUEL LEAK, FOUND THERE WAS PITTING CORROSION IN THE UPPER SURFACE OF THE LOWER INBOARD SPAR CAP CASTING. (INSPECTION OF THE LEFT WING CASTING SHOWED NO DEFECTS). SUBMITTER STATED IT APPEARS TO HAVE BEEN CAUSED BY ENTRAPMENT OF WATER BEHIND THE PROTECTIVE TAPE LINING THE INTERIOR OF THE FUEL CELL BAY. THE PITTING IS LOCATED STARTING AT 3.7 INCHES OUTBOARD OF THE INBOARD RIB WITH ANOTHER PIT AT 8.5 INCHES AND ANOTHER AT 10 INCHES. MOVING LOWER ON THE SPAR CAP CASTING ARE SEVERAL PITS BETWEEN 8.2 INCHES AND 11.8 INCHES. THE PITS ARE FROM .05 INCH AND .15 INCH DEEP. (X)