What was found
CORROSION ON FUSELAGE INTERNAL STRUCTURE AT THE END FITTING AND BASE OF FRAME 39, PRESSURE BULKHEAD BELOW THE INBD COLD AIR MANIFOLD CHECK VALVE. REMOVED PROFILE IAW SRM 51-40-21. REMOVED 2 EA COUPLINGS IAW SRM 51-40-21, PARA 6&7. REMOVED CORROSION IAW SRM 51-74-10. FOUND TO BE OUT OF LIMITS IAW SRM 53-15-17. CUT OUT DAMAGE IAW SRM 53-15-17. FABBED EXTRUSION & SHIM IAW SRM 53-15-17. LOCATED & DRILLED COUPLINGS IAW SRM 51-40-40. ALODINED PARTS IAW SRM 51-21-10. PRIMED & PAINTED IAW SRM 51-23-10. INSTALLED EXTRUSION, SHIM & COUPLINGS IAW SRM 53-15-17, INSTALLED PROFILE IAW SRM 51-40-21, PARA 5.