As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - ON FLIGHT 2457, AFTER TAKEOFF RECEIVED A DISPLAY COOL CAUTION MESSAGE. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. MAINTENANCE FOUND THE NR 2 DISPLAY FAN FAILED. PLACED ON MEL 21-24-2, RSI 351876. AIRCRAFT RETURNED TO SERVICE.