What was found
RECEIVED A PASSENGER DOOR WARNING MESSAGE IN FLIGHT AFTER HEARING A LOUD NOISE DURING OUR INITIAL CLIMB. ALSO A PROX SYSTEM 1 FAULT STATUS MESSAGE. NO PRESSURIZATION PROBLEMS NOTED. RAN QRH DIVERTED. (FLT#2953) CLOSED FOUND INNER PAX DOOR HANDLE LOWER SHAFT ASSY NOT TOUCHING STOP HOUSING . REMOVED . CLEANED . LUBED . AND REINSTALLED INNER HANDLE LOWER SHAFT ASSY . OPS CHECK GOOD IAW AMM. PERFORMED OPS CHECK OF PAX DOOR OUTER HANDLE OPS CHECK GOOD IAW AMM. PRESSURIZED A/C HELD PRESSURE FOR SEVERAL MINUTES IAW AMM. NO PRESSURE DROP.