As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK MAINTENANCE FOUND CORROSION FOUND ON CFIII LOWER SKIN ANTENNA DOUBLER INTERCOSTAL BETWEEN FR86 AND FR87 AND BETWEEN STGR 27R. REMOVED AND REPLACED ANTENNA DOUBLER INTERCOSTAL BETWEEN FR86 AND FR 87 STGR 27R TO 28R IAW EMB SRM 51-41-01.