As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH FLT 2778 PHX-PSP. CREW REPORTED UPON LANDING GEAR RETRACTION, EICAS MESSAGE "NOSE GEAR DOOR" WARNING ILLUMINATED. CREW ALSO REPORTED THAT IT APPEARED THAT THE NOSE GEAR DOORS WERE CYCLING OPEN/CLOSED. CREW ELECTED TO RETURN TO THE FIELD. CREW DID DECLARE AN EMERGENCY. AIRCRAFT LANDED SAFELY WITHOUT FURTHER INCIDENT. MX RIGGED THE DOORS.