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 REAR SPAR T/E LOWER SURFACE BTW RIB 7 TO RIB 8 ON LT WING 1EA; PERFORMED PERMANENT REPAIR ON REAR SPAR T/E UPPER AND LOWER SURFACE BTW RIB 7 TO RIB 9 ON LT WING IAW EA 57-0223 -18 REV 0 AND EC A18-704-01 THIS REPAIR IS CATEGORY B. ALL WORK ACCOMPLISHED ON NR 2018-261126.