As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4450, CREW REPORTED THEY WERE UNABLE TO OPEN THE MAIN CABIN DOOR FROM INSIDE THE CABIN. USED EXTERNAL HANDLE TO OPEN DOOR. AIRCRAFT REMOVED FROM SERVICE. CORRECTLY INSTALLED MAIN DOOR INTERIOR OPERATING HANDLE IAW AMM 52-18-05, MAIN DOOR FUNCTIONAL CHECKED GOOD. NO FURTHER DEFECT NOTED. AIRCRAFT RETURNED TO SERVICE.