What was found
DURING HEAVY MAINTENANCE: CORROSION ON SHEAR CLIP LOCATED AT FR 88, BTW STGR 27R TO STGR 28R, ON LOWER FUSELAGE IS BEYOND ALLOWABLE LIMITS; REMOVED AND REPLACED SHEAR CLIP LOCATED AT FR 88, BTW STGR 27R AND 28R, ON LOWER FUSELAGE IAW SRM 51-40-08 AND DWG. 170-65180-445 & 170-66041-002. REF. AEROMAN NR # 2018-245827. REF. P/N: 170-66531-001, SHEAR - CLIP. (CONSIDERED A MAJOR REPAIR)