What was found
AT GEAR UP, "NOSE DOOR" MESSAGE AND "GEAR DISAGREE" WARNING MSG, DURING QRH PRECEDURE, NOSE GEAR RETRACTED ON IS OWN. GEAR LOWERED DURING QRH PROCEDURE NORMALLY. ACFT RETURNED TO DEPARTURE AFTER T/O. EMERGENCY DECLARED AS A PRECAUTION. LANDING GEAR RETRACTION SYS, RESOLUTION DESCRIPTION: R & R NLG WOW NR 2 AND GR CENTERING PROXIMITY SENSOR HARNESS AND BRACKET IAW AMM 32-61-25. OPS CHECK GOOD. DMIL CLEARED PLACARD REMOVED.