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 FROM THE OUTSIDE USING THE CABIN DOOR HANDLE, DURING PREFLIGHT. SIGN OFF. PERFORMED VISUAL AND OPERATIONAL CHECK OF DOOR AND NO DEFECTS NOTED AT THIS TIME. NO DEFECTS NOTED AT THIS TIME OF PRECATCH. WORK DONE IAW 560XL AMM CH 52-10-00.