As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEAR ON INTERCOSTAL LOCATED AT STRINGER 3 RH BTW FS 364.00 TO FS 379.00 AT PASSENGER COMPARTMENT INTERNAL STRUCTURE. INTERCOSTAL LOCATED AT STRINGER 3 RH BTW FS 364.00 TO FS 379.00 AT PASSENGER COMPARTMENT INTERNAL STRUCTURE WAS REPLACED PER DWG PLSH670-30202 REV. C AND PER CRJ900 SRM 51-42-21-001-001-A01