What was found
GEAR DISAGREE AFTER TAKEOFF NOSE GEAR REMAINED DOWN COMPLIED WITH QRH ALL INDICATIONS NORMAL EXCEPT NOSE DOOR OPEN MESSAGE AIRCRAFT OPERATED ON CONTAMINATED RUNWAY AND TAXI WAY WITH SNOW POST FLIGHT REVEILS ICE ON PROX SENSORS. ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED. R & R NLG WOW SENSOR BRACKET IAW CMM 32-20-04 PERFORMED 3 GEAR SWINGS OPS CK AND RIGGING GOOD NOFURTHER DEFECTS AT THIS TIME.