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 LOCATED BTWN RIB 8-9 UPPER SURFACE ON LH WING; PERFORMED PERMANENT REPAIR LOC EXTERNAL SKIN BTWN RIB 8-9 UPPER SURFACE ON LH WING IAW EA 57-0384-18 REV.0 PART 1 & 2 / EC A18-990-01. REF. AEROMAN NR 2018-395092 FOR DETAILS.