As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AND UPON RETRACTING LANDING GEAR, RECEIVED A NOSE GEAR UP DISAGREE WARNING. EXTENDED THE LANDING GEAR AND THE WARNING DID NOT PERSIST. ATTEMPTED TO RETRACT GEAR AGAIN. WARNING RETURNED. RETURNED TO BIL. REMOVED AND REPLACED THE NOSE LANDING GEAR SOLENOID VALVE IAW CRJ MM 32-33-10. PERFORMED SEVERAL GEAR SWINGS. OPS CHECKS GOOD.