As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN DOOR HAS LOUD SQUEAL AND STIFF TO OPEN/CLOSE. REMOVED FROM SERVICE. CLEANED ACCESSIBLE AREAS OF DOOR HINGE CHAIN AND SPROCKET. COMPLIED W/ GVI OF MAIN CABIN DOOR - OPEN CLOSED L1 DOOR NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.