What was found
ON GEAR RETRACTION RED GEAR UNSAFE & DOOR LIGHTS ON FRONT PANEL, AND MAIN GEAR DOOR LIGHTS ON S/O PANEL GEAR WAS RECYCLED AND GEAR LIGHTS NOT OUT, WOULD NOT RETRACT. ALL QRH PROCDURES WERE ACCOMPLISHED 7000LBS OF FUEL DUMPED AND AIRCRAFT LANDED AT MEM. JACKED AIRCRAFT AND PERFORMED NORMAL GEAR SWING SEVERAL TIMES IN REFERENCE TO 727-200 AMM 32-32-000-5, GEAR WORKED NORMALLY. AS PRECAUTIONARY REMOVED AND REPLACED LANDING GEAR ACCESORY UNIT IN REFERENCE TO 727-200 AMM 32-09-121-4. PERFORMED LANDING GEAR ELECTRONIC MODULE ADJUSTMENT/TEST IN REFERENCE TO 727-200 AMM 32-09-121-5. ALL TESTS PASSED. AGAIN CYCLED GEAR SEVERAL TIMES AND ALL INDICATIONS AND SWINGS CHECKED GOOD.