What was found
DURING C-CHECK, DISCREPANCY AS FOLLOWS, N/R 3912, AFT. FUSELAGE SKIN HAS DENT AT FR 77 AND STR 22R. BLENDED OUT AREA, FOUND DENT BEYOND LIMITS IAW SRM 53-10-10. CUT OUT DAMAGE AREA SRM 53-10-10. PERFORMED HFEC OF CUT-OUT AREA NTM PT 1 51-31-05. NO DISCREPANCIES NOTED. INSTALLED DOUBLER, MATERIAL USED ALCLAD 2024 T3 0.100 SIZE 10 INCHES X 15 INCHES SRM 53-10-10. TREATED AND PRIME AREA AS REQUIRED AND APPLY PRC REF: A-300 51-40-10 AND SRM 51-60-00 / 51-40-20 PAINT PREPPED AND PAINTED IAW SRM 51-40-12 PAGE BLOCK 1.