What was found
C-CHECK - CORROSION ON THE BOTTOM OF THE LAV SERVICE DOOR CUTOUT ON THE LOWER FWD FUSELAGE. DRILLED OUT FASTENERS AND REMOVED SERVICE PORT INTERNAL DOUBLER IAW RD 8/4-53-347. PERFORMED HFEC OF REMAINING MATERIAL FOR CRACKS IAW NDTM PART 6 51-00-01 REF RD 8/4-53-347 SECTION 1, SHEET 9, STEP 2 NO CRACKS NOTED. FABRICATED BACKING PLATE AND REPAIR PACKER IAW RD 8/4-53-347 SHEET 5, SECTION A-A. COUNTERSUNK REPAIR PACKER AND ALODINED AND PRIMED REPAIR PACKER IAW RD 8/4-53-347. INSTALLED DOUBLER AND PACKER IAW RD 8/4-53-347.