As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AREA OF AFT LAV SERVICE CHAFED AT WATER FILL VALVE, MARKED. C-CHECK RO 12/26/2020. FOUND CHAFE DAMAGE TO AFT LAV SERVICE CANNON PLUG DOUBLER AT WATER FILL VALVE, TO BE BEYOND ALLOWABLE DAMAGE LIMITS. REMOVED AND INSTALLED NEW DOUBLER, REF CRJ 900 SRM AND DWG. SEE CONTINUATION CARD FOR DETAILS. COMPLETED FORM M-337. PERFORMED LEAK CHECK, NO LEAKS NOTED.