What was found
CREW REPORTED GEAR DISAGREE WARNING MESSAGE 28 SECONDS AFTER SELECTING GEAR UP ON TAKEOFF FROM DAY. NOSE GEAR INDICATED RED BOX WITH SLASHES THROUGH IT. PROXIMITY SYSTEM FAULT 1 STATUS MESSAGE DISPLAYED CONCURRENTLY WHEN GEAR SELECTED DOWN. GEAR EXTENDED NORMALLY AND INDICATED DOWN. CREW RETURNED TO DAY AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND AND REMOVED A 2-INCH ICE BUILDUP FROM THE BOTTOM OF THE NOSE LANDING GEAR FOLLOW-UP DOOR. MAINTENANCE INSPECTED THE NOSE GEAR AND DOOR AND PERFORMED CHECKS USING THE AIRCRAFT MAINTENANCE MANUAL. NO DAMAGE WAS NOTED. AIRCRAFT WAS RELEASED FOR SERVICE.