What was found
BOTH LT AND RT MAIN GEAR INDICATOR LIGHTS WERE INTERMITTENT AND AT TIMES WOULD NOT ILLUMINATE AT ALL WHEN GEAR WAS SELECTED DOWN, ALL OTHER INDICATIONS WERE, CORRECT. ACCOMPLISHED CHECKLIST AND LANDED NORMALLY ALTERNATE GEAR EXTENSION WAS NOT USED. TROUBLESHOT FOUND LIGHT ASSEMBLY FOR THE GEAR INDICATOR TO BE FAULT. REMOVED AND REPLACED GEAR INDICATOR LIGHT ASSEMBLY IWTH NEW UNIT. OPERATION CHECK IS GOOD. ALL WORK PERFORMED I.A.W. HAWKER 400XP AMM 32-60-00.