As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND CROSSBEAM AT FRAME 84 CORRODED IN THE CENTER. MAINTENANCE REPAIRED CROSS BEAM AT FRAME 84 IAW EMB ETD2013-170-002389-B REV B. "MAJOR REPAIR", THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.