What was found
FLIGHT CREW REPORTS UNABLE TO MOVE R1 DOOR ARM/DISARM HANDLE INDICATION UNCLEAR. REMOVED FROM SERVICE. OPENED DOOR FROM OUTSIDE AND PERFORMED GVI OF VISIBLE MECHANISM. NO DEFECTS NOTED. CLOSED DOOR AND OPERATED ARM/DISARM HANDLE. FOUND TO BE DIFFICULT. APPLIED HEAT TO DOOR DUE TO LOW AMBIENT TEMPERATURE. CYCLED ARM/DISARM HANDLE VARIOUS TIMES. OBSERVED NORMAL FUNCTION OF HANDLE AND INDICATION, NO FURTHER DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.