As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OUTBOARD FLANGE OF FLOORBEAM AT LBL 27 IS CORRODED AROUND NUT PLATE TABS/ HOLES FROM FS 600 TO FS 621. FOUND CORROSION BEYOND LIMITS ON P/N 601R35031-263. REMOVED AND REPLACED FLOORBEAM CAP, P/N 601R35031-263, IAW CRJ BOMBARDIER REO 601R-53-61-3778 AND BSC EO 601R-53-19889.