What was found
WHEN LOWERING GEAR FOR LANDING, NOSE LIGHT DIDN'T ILLUMINATE. RED UNSAFE LIGHT WAS OUT AND BOTH MAIN LIGHT ILLUMINATED. PERFORMED CHECKLIST PROC. AND ACTIVATED BLOW DOWN SYSTEM. REMOVED AND REPLACED BOTH LIGHT BULBS FOR NOSE LIGHT INDICATION. OPS CHECKS GOOD. BLED LANDING GEAR SYSTEM AND RESAFTIED BOTTLE, SERVICED BOTTLE IAW MM 32-30-00, 33-10-02, 12-13-01.