As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TO REMOVAL NLG AFT DOOR, WAS FOUND CORROSION ON NLG AFT DOOR HINGE FITINGS BORE. CORROSION ON NLG AFT DOOR HINGE FIITINGS BORE WAS FOUND WITH EXCESIVE DAMAGE THEREFORE FITTINGS WERE REPLACED PER CRJ-900 SRM 53-00-00-101-001-A01 AND SRM 51-41-02-001-001-A01 AND CRJ-900 AMM 20-21-00-910-801-A01