What was found
GEAR IN TRANSIT LIGHT ANNUNCIATOR ILLUMINATED NORMALLY DURING POWER REDUCTION, HOWEVER IT WOULD NOT EXTINGUISH AFTER ADVANCING POWER AND REMAINED ILLUMINATED UNTIL GEAR WAS EXTENDED FOR LANDING. REMOVED AND REPLACED NOSE GEAR UP LOCK SWITCH, PERFORMED GEAR EXTENSION AND RETRACTION, OPS CHECK SATISFACTORY IAW BEECH 1900 MM 32-60-00 AND 32-30-00 P/N 100-381006-1.