As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ENTRY DOOR HAS A SQUEAL FROM LOWER LEFT CORNER WHEN PRESSURIZED. PRESSURIZED TO 3 PSI, SQUEAL STARTED AND WAS TRACED TO ENTRY DOOR HANDLE AT AFT HINGE POINT ON EXTERIOR HANDLE. R & R THE DOOR CONTROL BOX. PRESSURIZED ACFT NO LEAKS NOTED.