What was found
CARGO DOOR WARNING LIGHT CAME ON AS POWER WAS BEING APPLIED FOR TAKEOFF, CREW DISCONTINUED TAKEOFF ROLL AND RETURNED TO GATE. ONE OF THE FOLLOWING: DOOR CLOSING PROCEDURES, DOOR HARD TO CLOSE, DOOR CLICKCLACK RIGGING/ LUBRICATION, OR SWITCH RIGGING. CLICK CLACKS, BAYONET PINS, MICROSWITCHES WERE CLEANED AND LUBED. DOOR OPS CHECK GOOD, FLIGHT CONTINUED WITH NO FURTHER DOOR PROBLEMS.