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 UNDER RT NUMBER THREE PYLON ENGINE HEAT SHIELD ON THE INTERNAL STIFFENERS. MAINTENANCE REMOVED AND REPLACED THE CORRODED INTERNAL STIFFENERS (P/N 170-39583-001 AND 170-39583-002) PER THE EMB SRM. AC STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.