As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT GOT DISPLAY COOL CAUTION MESSAGE COMPLIED WITH QRH MESSAGE DID NOT EXTENGUISH, LANDED AS DIRECTED BY QRH. JUST PRIOR TO LANDING PFD1 MFD1 AND PFD 2 HAD DISPLAY TEMP MESSAGE ILLUMINATED ON THEM. ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED. FOUND THAT PREVIOUS CREW DEFERED THE WRONG FAN. REMOVED & REPLACED GROUND FAN ASSY.OPS CHECK GOOD.IAW AMM 21-24-19. DEFER CLEARED & PLACARD REMOVED.