As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER DOOR, BACK-UP SIL AT STGR 21L, BETWEEN FS 310 AND FS 319 IS CORRODED. C-CHECK RO 12/26/2020. REPLACED PASSENGER DOOR BACK UP SILL AT STGR 21L BETWEEN FS 310 AND FS 319, REF DRAWING CRJ900 SRM. COMPLIED WITH SKYWEST TASKCARD. ALL ASSOCIATED CHECKS C/W. SEE CONTINUATION CARD FOR FURTHER DETAILS ON MAINTENANCE PERFORMED.