What was found
GEAR WARNING HORN SOUNDED ON 3 SEPARATE OCCASIONS. FIRST, FOR 30 SECONDS AT IAS OF 210 KTS & FL220, FLAPS 0. INCREASE OR DECREASE OF THROTTLE SETTING WOULD NOT EXTINGUISH HORN. SECOND, HORN SOUNDED FOR ABOUT 10 SECONDS, AT 210 KIAS APPROACHING 8000 FT. THIRD, HORN SOUNDED FOR JUST A FEW SECONDS AS GEAR SELECTED & FLAPS SELECTED TO 35 ON TURN TO FINAL. INSPECTED AND SYSTEM OPERATES NORMALLY AT THIS TIME ON THE GROUND. WORK DONE IAW AMM 7-10-01, 27-51-00, 29-11-07 AND 34-11-01.