As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE, NOSE GEAR WOULD NOT RETRACT AND FOLLOWING MESSAGES OBSERVED; RED GEAR DISAGREE AND NOSE DOOR OPEN. NOSE GEAR WAS DOWN AND LOCKED AND NEVER INDICATED AN INTRANSIT LIGHT. ADJUSTED THE NOSE GEAR EXTENDED PROXIMITY SENSOR IAW CRJ MM 32-61-05. PERFORMED GEAR SWINGS AND OPS CHECK GOOD.