As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE: CORROSION UPPER SURFACE OF TOP SKIN LOC. REAR SPAR BTW RIB18 AND RIB19 ON LH WING; EVALUATED REWORK AREA ON UPPER SURFACE OF TOP SKIN REAR SPAR BTW RIB18 AND RIB19 ON LH WING AND FOUND WITHIN LIMITS IAW SRM 57-21-11-283-007.