What was found
DURING HEAVY CHECK MAINTENANCE FOUND CORROSION, AFT FUSELAGE AT WASTE BOX ON STRINGER 28R AT FRAME 88. REMOVED DAMAGE STRINGER BY CUTTING, DRILLED AND INSTALLED SPLICE REPAIR PARTS ON STRINGER 28R BETWEEN FRAMES 86-90 REF EDT2020-170-008593. RESTORED SURFACE PROTECTION PER SRM 51- 23-05, 51-23-06. A/C REMAINS IN CHECK.