As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY CHECK FOUND CORROSION - CENTER GUSSET CORRODED AS MARKED FR 90 REMOVED CORROSION BY BLENDING ON THE CENTER GUSSET AT FRAME 90. BLENDED AREA IS 2.0" X 2.0" X .015". NOMINAL THICKNESS IS .063". THIS IS OUT OF LIMITS. REF SRM 51-75-16. REMOVED CENTER GUSSET FR 90 REF EMB SRM 51-40-08. INSTALLED CENTER GUSSET FR 90 REF EMB SRM 51-40-08.