As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE FLIGHT CREW REPORTED NR 1 MFD SCREEN LOST ALL INFORMATION. THE AIRCRAFT TURNED BACK TO AIRPORT. SUSPECT OVERHEATING. REPORTED THAT MAINTENANCE FOUND COCKPIT DISPLAY FILTER EXTREMELY DIRTY. FILTER REPLACED IAW AMM AND TESTED SERVICEABLE.