As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION/WEAR ON ANGLE BTW BULKHEAD 67.50% REAR SPAR DATUM AND BL=0 OF FWD FACE OF APU FIREWALL BULKHEAD AT TAILCONE AREA. DUE EXCESIVE DAMAGE ON ANGLE BTW BULKHEAD 67.50% REAR SPAR DATUM AND BL=0 OF FWD FACE OF APU FIREWALL BULKHEAD AT TAILCONE AREA WAS REPLACE PER CRJ-900 SRM 51-10-06-001-001-A01 AND IAW SRM 51-42-06-001-001-A01.