What was found
CABIN INTERNAL STRUCTURE, FRAME CRACKED AT FASTENER LOCATION WHERE AC DUCT SUPPORT BRACKET IS SECURED TO FRAME, STATION 1540, BETWEEN STRINGER 8R & 9R. MARKED CUT OUT DAMAGE SECTION OF FRAME & INSTALLED REPAIR DOUBLERS IAW SRM 53-00-07 REPAIR 1. INITIATED DIP TO RE-INSPECT REPAIR 12,000 FLIGHT CYCLES FROM INSTALLATION OR 50,000 AIRFRAME FLIGHT CYCLES, WHICHEVER COMES FIRST & AT INTERVALS OF 12,000 FLIGHT CYCLES THEREAFTER IAW SRM 53-00-07 REPAIR 1 TABLE 203 ZONE 3.