As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB PHASE, AROUND 10000', CREW RECEIVED A DISPLAY COOL FAN FAIL MESSAGE. CREW FOLLOWED THE QRH AND TRIED FANS. CREW DECLARED AN EMERGENCY AND RETURNED TO PHL. AROUND 600' THE MESSAGE WENT AWAY. CREW CANCELED THE EMERGENCY AND CONTINUED TO PHL WITHOUT FURTHER ISSUE. FERRY TO CKB FOR PRESSURIZATION CHECK AND DISPLAY COOL PERM REPAIR.