What was found
NOSE GEAR WOULD NOT RETRACT ON TAKE OFF. EMERGENCY DELCARED AND FLIGHT RETURNED TO RDU. LANDED WITHOUT INCIDENT. AIRCRAFT WAS GROUNDED. TROUBLESHOT NOSE GEAR IAW CARD 32-96-16, NO DEFECTS NOTED. CYCLED THE NOSE GEAR SEVERAL TIMES, GROUND CHECKED GOOD. REPLACED THE PROXIMITY SWITCH ELECTRONIC UNIT IAW AMM 32-60-04, ALL CHECKED NORMAL. ACFT OK FOR SERVICE.