What was found
PASSENGER DOOR LATCH CAUTION MESSAGE RECEIVED AFTER TAKEOFF ACCOMPANIED BY PROX SYS FAULT 1 MESSAGE AND RED DOOR HANDLE MECHANICAL INDICATING RED AND PAX DOOR WARNING AT TOUCH DOWN. (ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED) WHEN ACFT ARRIVED AT GATE, FOUND PAX DOOR OUTER HANDLE OPEN APPROX 4 INCHES INSPECTED, CYCLED PAX DOOR AND NO DEFECTS WERE NOTED. PERFORMED OPS TEST OF PAX DOOR IAW AMM 52-11-00.