As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, MOVED GEAR HANDLE TO THE UP POSITION (NOSE GEAR DOOR & GEAR DISAGREE) WARNING MESSAGES. NOSE GEAR SHOWING GREEN DOWN & LOCKED. TOUCHED DOWN LESS THAN 300FMP (AIRCRAFT RETURNED TO ATL AFTER TAKEOFF, EMERGENCY DECLARED). FLT 4601 DEL 180 MINS. REMOVED AND REPLACED PRIORITY VALVE IAW CRJ 200 AMM 32-33-15 OPS CHECK OK. (S)