What was found
GEAR DISAGREE WARNING WITH GEAR HANDLE UP AFTER TAKEOFF, NOSE WHEEL DID NOT RETRACT. NOSE DOOR OPEN WARNING. (FLIGHT 4278 - FILED CLOSED) INSPECTED NLG WITH NO DAMAGE NOTED. BRACKETS HOLDING SENSORS ARE NOT BENT AND ALL SENSORS ARE SECURE. FOUND FAULT IN PSEU TO BE S23 FAR. JACKED AIRCRAFT AND CONFIRMED S23 FAR AND GAP OUT OF RANGE AT .075". VERIFIED NOSE STRUT IS AT PROPER LEVEL ON GROUND AND FULLY EXTENDED WHEN JACKED. ADJUSTED NLG CENTERED/EXTENDED PROX SENSOR TO PROPER RANGE (.045"-.055") REF AMM 32-61-05. S23 NOW READS NEAR WHEN JACKED AND FAR WHEN ON GROUND. LANDING GEAR EXTENSION AND RETRACTION OPS CHECK GOOD.