What was found
AFTER TAKEOFF, GEAR HANDLE PLACED IN UP POSITION. NOSE GEAR DID NOT RETRACT. ALL THREE LANDING LIGHTS WERE OUT AND UNLOCK LIGHT WAS ILLUMINATED. COULD HEAR THAT IT WAS NOSE GEAR THAT WAS DOWN. RAN GEAR RETRACT CHECKLIST AND RECEIVED THREE GREEN GEAR DOWN LIGHTS. JACKED ACFT, CYCLED GEAR 10 TIMES, NO DEFECTS NOTED. VERIFIED NLG STRUT EXTENSION UPON EXTENSION. NO DEFECTS NOTED. VERIFIED NLG STEERING UNIT CENTERING FUNCTION FROM BOTH DIRECTIONS. RANG OUT NLG UPLOCK SWITCH. FOUND TO BE RESISTIVE. REPLACED NLG UPLOCK SWITCH WITH NEW SWITCH. RIGGED SWITCH. OPS CHECKS SATISFACTORY. DOWNLOADED ACFT. COMPLETED IAW MM CHAP 32-30-05.