What was found
AFTER T/O FROM KMCO, GEAR WAS RETRACTED, LANDING GEAR WARNING HORN SOUNDED AND COULD NOT BE SILENCED UNTIL FLAPS CAME TO 0 DEG. CLEANED CANNON PLUGS ON GROUND CONTROL SWITCHES NR 1 AND 2. OPS CHECKED SYSTEM AS PER UAL 27-00-12, OPS NORMAL ON GROUND.