What was found
RECEIVED PAX DOOR OUTER HANDLE CAUTION. WHILE PERFORMING QRH, PAX DOOR WARNING MSG APPEARED FOR APPROX 3 MINUTES. WARNING MSG CLEARED WITH NO CREW ACTION. EMERGENCY DECLARED & FLIGHT RETURNED. ON LANDING, OUTER HANDLE WAS FOUND OUT. COMPLIED WITH OPS CHECK OF PAX DOOR IAW AMM 52-11-00. FOUND DOOR TO BE DIFFICULT TO OPERATE FROM THE OUTSIDE, ALL OTHER INDICATIONS NORMAL. FOUND UPPER PIVOT ASSEMBLY FOR PAX DOOR LINKAGE BINDING. REMOVED, CLEANED & REINSTALLED PAX DOOR UPPER PIVOT ASSEMBLY IAW AMM 52-11-21. OPS CHECKED GOOD.