As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN FOR HEAVY CHECK, LEVEL TWO CORROSION WAS FOUND ON AFT SIDE OF THE LAV DUMP BOX STANDOFF. MAINTENANCE REMOVED CORRODED STANDOFF, FABRICATED NEW STANDOFF AND REPLACED ON AC PER EMB SRM. AC STILL OUT OF SERVICE FOR REMAINDER OF HEAVY CHECK.