As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON REF BP NR 2018-143247. INTERNAL STRUCTURE COUPLING BTW FR 30 TO FR 31 AT STR 41R IN FWD CARGO COMPARTMENT. REPLACED INTERNAL STRUCTURE COUPLING BTW FR 30 TO FR 31 AT STR 41R IN FWD CARGO COMPARTMENT IAW SRM 51-72-11 AND DRAWING D532 32647.