What was found
(CAN) SHORTLY AFTER DEPARTURE, THE ACFT AIRCREW REPORTED THE COPILOT`S SIDE PRIMARY FLIGHT DISPLAY SCREEN FAILED AND THE SCREEN WENT COMPLETELY BLANK. THE FLIGHT CREW RETURNED BACK TO BASE. MAINTENANCE INVESTIGATED THE SNAG AND THE COPILOT FLIGHT DISPLAY WAS R & R WITH A SERVICEABLE UNIT. ACFT SYSTEMS WERE TESTED AND RETURNED TO SERVICE. ON A SUBSEQUENT FLIGHT SHORTLY AFTER, THE PILOTS AGAIN REPORTED THE COPILOT PRIMARY FLIGHT DISPLAY MOMENTARILY WENT BLANK. PILOTS RESET THE SYSTEM AND DISPLAY CAME BACK ON. THE ACFT RETURNED TO BASE. MAINTENANCE CARRIED OUT TROUBLESHOOTING AND FUNCTIONAL CHECKS AND SWAPPED THE FLIGHT DISPLAYS FOR FAULT ISOLATION. ALL CHECKS CARRIED OUT SERVICEABLE. ACFT WAS RETURNED TO SERVICE AND NO ISSUES REPORTED SINCE.