What was found
DURING HEAVY CHECK, REPORTED THAT CORROSION ON DRAIN INTERCOSTAL, REAR BETWEEN FRAMES 86-87 BETWEEN STRINGERS 27R-28R. MAINTENANCE REMOVED INTERCOSTAL AND FABRICATED NEW PART AND INSTALLED PART IAW SRM 170/175, SRM 51-41-01, 51-31-01, 51-23-04, 51-23-05, 51-23-06.