As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPPER INTERIOR PAX DOOR SILL F.S. 282 @ STRGR 4 LT. IS CRACKED THROUGH FASTENERS BOTH SIDES. (C-CHECK) RO 4/9/2020 REMOVED ANGLE CRACKED AT UPPER INTERIOR PAX DOOR SILL AREA FS 282 AND STGR 4 LT AND INSTALLED NEW BRACKET P/N 600-31057-19. IAW CRJ200 SRM.