As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN DOOR EXTREMELY DIFFICULT TO OPEN. FELT LOCKED UP LIKE METAL ON METAL. C/W VISUAL INSP. OF MCD. NO DEFECTS NOTED. C/W OPS CHECK OF MCD IAW AMM 52-11-00-710-801-A02. OPS CHECK GOOD. NO FAULTS NOTED AFTER MULTIPLE OPS OF DOOR. RETURNED TO SERVICE. NO PARTS REPLACED. COULD NOT DUPLICATE.