As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE REMOVING FRAME SECTOR AT FS 379.00 FOUND CORROSION ON WATER WASTE SERVICE DOOR LOWER DIAPHRAGM P/N SH670-32284-3. C-CHECK RO 12/14/2020. REMOVED AND INSTALLED NEW SERVICABLE DIAPHRAGM ON LOWER FWD WATER WASTE DOOR SURROUND STRUCTURE, REF DWG AND CRJ 700 SRM. COMPLIED WITH TASK CARD. PRESSURE CHECKS GOOD.