What was found
HORIZONTAL STAB ACTUATOR COMPARTMENT STA 1088 BULKHEAD FORWARD FACE HAS EVIDENCE OF CORROSION ABOVE THE APU AIR INLET DUCT ATTACH TO THE BULKHEAD. REMOVED, FABRICATED NEW STIFFENER 5 AND REPLACED IAW SRM 51-40-02-0G-0,51-40-05-0G-0,51-40-08-0G-0,51-20-01-0G-0, AMM 51-21-72-370-804 AND DWG 148A2488. REMOVED AND INSTALLED FABRICATED NEW STIFFENER AND REMOVED AND REINSTALLED DIFUSSER DUCT AND APU TRANSITION DUCT IAW SRM 51-40-02-0G-0, 51-40-05-0G-0, 51-40-0G-0, 51-20 -01-0G-0, AMM 51-21-72-370-804 AND DWG 148A2488 AMM 49-15-15-400-801.