As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING COMPLIANCE OF CRJ-200 JOB CARD: 53-160-635 AT FS409+128, RBL27, A CRACK WAS FOUND AT THE VERTICAL BEAM LOWER IB FLANGE THROUGH THE BOTTOM MOST RIVET WHERE THE VERTICAL BEAM ATTACHES TO THE PRESSURE BULKHEAD AT FS409+128. RBL 27, CRACKED AT LWR IB FLANGE STARTING AT THE BOTTOM EDGE AND EXTENDING INTO THE 1ST RIVET. REMOVED DAMAGE ON RBL 27 IB LWR FLANGE IAW REO #601R-53-41-056