What was found
DENT OR POSSIBLE BLENDOUT ON LOWER SKIN AT APPROX BS 950, STR 27L. REMOVED INTERCOSTAL FASTENER ON FUSELAGE SKIN BS 937, 2 INCH INBD OF STR 27L. MEASURED PREVIOUS BLEND OUT TO SKIN AT 0.020" AT DEEPEST SPOT. BLEND IS APPROX 1" LONG BY 1" WIDE. FOUND ADDITIONAL BLEND MARKS TO SKIN UNDER PAINT. REMOVED TWO ADDITIONAL RIVETS ONE FWD AND ONE AFT OF DAMAGED RIVET/DEEP BLEND OUT. WORKED OUT SCRATCHES BY HAND. IAW SRM 51-40-02 AND 53-00-01-01-1A. PERFORMED HFEC ON AFFECTED AREA PER 737 NDT PART 6, 51-00-00, PROCEDURE 23; AS WELL AS OPEN HOLE INSPECTION ON THREE REMOVED RIVETS PER NDT PART 6, 51-00-00, PROCEDURE 16. NO CRACK INDICATIONS NOTED. ALSO PERFORMED SKIN THICKNESS MEASUREMENTS ON AFFECTED AREA IAW NDT PART 4, 51-00-00, PROCEDURE 2 AFTER BLENDING.