What was found
WHEEL WELL FIRE WARNING WAS TRIGGERED AFTER LANDING GEAR SELECTED UP, CREW FOLLOWED QRH PROCEDURE TO DOWN MLG, WARNING LIGHT WENT OUT FOR 1 SEC THEN CAME ON AGAIN. GROUND CHECK FOUND NO OIL/AIR LEAKAGE. ALL WHEELS AND BRAKES WERE CHECKED NORMAL. A/C BACKED INTO SERVICE TO TPE. SENSORS /WIRING CONDITION CHECKED STILL NORMAL. THE W/W FIRE DETECTION CONTROL CARD WERE REPLACED. NO FURTHER WARNING TRIGGERED EVER SINCE.