What was found
DURING HEAVY MAINTENANCE, AFT FUSELAGE SKIN AROUND WASTE VENT FRAME 69-70 STRINGER 31-32R HAS CORROSION. NO MX-220 IS REQUIRED; REF NON-ROUTINE 20060, SERVICE ORDER 440577, REMOVED CORROSION AND INSTALLED REPAIR DOUBLER IAW SRM 53-41-11-300-004 CAT A REPAIR. NO RE-INSPECTION IS REQUIRED.