As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN AVIONICS BAY DOOR AFT RIGHT HAND/LEFT HAND SEAL RETAINER CORRODED. C-CHECK RO 10/9/2020. EVALUATED DAMAGE AND FOUND BOTH LT AND RT SEAL RETAINERS OUT OF LIMITS. REMOVED AND REPLACED SEAL RETAINERS, REF CRJ 900 SRM. SEE CONTINUATION CARD FOR DETAILS OF WORK PERFORMED.