As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE A/C WAS IN FOR HEAVY CHECK FOUND FRAME 14 CROSSBEAM CORRORED ON THE UPPER RT FLANGE. MX REMOVED CORROSION BY DRILLING THROUGH WITH A NR 21 DRILL AND FILLING HOLE WITH A PROTRUDING HEAD RIVET IAW EMB 170 SRM 53-10-10 P/N MS20470AD-5-4. A/C REMAINS IN CMH FOR HEAVY CHECK COMPLETION.