As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JOINT PIECE AT STRINGER 21R ON UPPER PART OF FWD LAV WATER WASTE DOOR CUTOUT IS CORRODED BETWEEN FS 379 TO 394. LOCATED AND DRILLED NEW SERVICEABLE JOINT PIECE AT STGR 21R ON UPPER PART OF FWD LAV WATER WASTE DOOR CUTOUT PN# SH670-32301-5 IAW CRJ-900 SRM 51-40-11-001-001-A01 AND INSTALLED IAW CRJ-900 SRM 51-42-06-001-001-A01