As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN DOOR WILL NOT OPEN. REMOVED FROM SERVICE. PERFORMED OPERATIONAL CHECK OF MAIN CABIN DOOR. CYCLED DOOR OPEN AND CLOSED . CYCLED ARM AND DISARM HANDLE . OPERATIONAL CHECK GOOD. PERFORMED VISUAL INSPECTION OF DOOR ASSY AND AIRFRAME ASSY. VISUAL INSPECTION GOOD. LATCH OPS CHECK GOOD. NO DISCREPANCIES NOTED. AIRCRAFT OK FOR SERVICE. REF AMM 52-11-00. AIRCRAFT RETURNED TO SERVICE.