What was found
THE CARGO DOOR WARNING LIGHT CAME ON DURING CLIMBOUT, CREW RETURNED TO THE STATION. ONE OF THE FOLLOWING: DOOR CLOSING PROCEDURES, DOOR HARD TO CLOSE, DOOR CLICK CLACK RIGGING/ LUBRICATION, OR SWITCH RIGGING. ALL SWITCHES AND CLICK CLACKS WERE INSPECTED AND LUBRICATED, NO DEFECTS WERE NOTED. AIRCRAFT GROUND PRESSURIZATION RUN WAS PERFORMED, OPS CHECKED GOOD. (NM05200403789) (K)