What was found
WHILE ADDING POWER FOR TAKEOFF ROLL, LOST NOSE WHEEL STEERING. TAKEOFF WAS ABORTED AT APPROXIMATELY 10 KNOTS. AFTER COMING TO A STOP, CREW RESET THE ANTI-SKID NOSE WHEEL STEERING SWITCH, CLEARED THE RUNWAY, AND RETURNED TO THE GATE. MAINTENANCE REPLACED THE FIRST OFFICER'S STEERING CONTROL UNIT WITH NO HELP. AFTER CONFERRING WITH THE SHOP, REMOVED COVER FROM THE NEW STEERING UNIT AND FOUND CORROSION BUILD-UP INSIDE ON CONNECTOR. CLEANED CORROSION FROM THE UNIT. OPERATIONAL CHECK OK.