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 EXTERNAL SKIN BTW FR69 TO FR70 AND BTW STR29R TO STR30R OUTFLOW VALVE AREA ON LOWER FUSELAGE; REF. NRC-2018-159008 W/O 909857. PERFORMED REPAIR ON EXTERNAL SKIN BTW FR69 TO 70 AND BTW STR 29R TO STR 30R OUTFLOW VALVEON LOWER FUSELAGE IAW SRM 53-41-11-300-004.