What was found
GEAR UNSAFE HORN SOUNDED WHEN LEVER WAS RAISED ON T/O. HORN WAS SILENCED NORMALLY WITH THE GEAR HORN OFF BUTTON. THREE RED LIGHTS ON BOTH PANELS STAYED ON WITH HANDLE IN UP POSITION. GEAR WAS LOWERED AND 3 GREEN ANNUNCIATED. HYD PRESSURE & QUANTITY NORMAL. GEAR WAS RECYCLED WITH SAME RESULTS BUT NO HORN. JACKED A/C PER 07-11-00-2 DC-10-10 M/M SWUNG GEAR PER DC-10-10 M/M 32-30-00-5, WAS ABLE TO DUPLICATE. FOUND BROKEN ROLLER ON ACTUATOR FOR NR 3 THRUST LEVER LANDING GEAR WARNING HORN SWITCH. REPLACED ACTUATOR ON SWITCH S1-342, PER DC-10MM 76-11-04-2. CYCLED LANDING GEAR SEVERAL CYCLES, PER DC-10MM 32-30-00-5, ALL INDICATIONS NORMAL.