As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON TAKEOFF IN ATL, GEAR SELECTED UP LT & RT MAIN CAME UP AND CENTER STAYED DOWN, GOT NOSE DOOR OPEN MASTER CAUTION WARNING FOLLOWED BY A GEAR DISAGREE WARNING. PUT GEAR DOWN LANDING ATL. AIRCRAFT RETURNED TO ATL AFTER T/O. FLT 4564 CX AND ON 11/16/06 FLT 4322 CX.