What was found
NOSE GEAR DISAGREE MESSAGE APPEARED AFTER LANDING GEAR WAS MOVED TO UP POSITION. RAN QRH, MESSAGE PERSIST. MANUALLY DEPLOY GEAR AND MESSAGE CLEARED. NOSE DOOR OPEN WARNING MESSAGE APPEARED AFTER GEAR DISAGREE MESSAGE WAS DISPLAYED. NO GEAR BOXES WERE RED, ONLY WHITE. ONCE GEAR WAS DEPLOYED, ALL BOXES GREEN AND LOCKED. MESSAGE APPEARED AT 150KTS. EMERGENCY LANDING WAS DECLARED. ***AIRCRAFT REMOVED FROM SERVICE **** ADJUSTED PS14GA( NLG OLEO PROX SENSOR) IAW AMM 32-61-05 OPS CK GOOD