What was found
CREW REPORTED NEWLY INSTALLED, OVERHAULED STAND-BY FLIGHT DISPLAY, BECAME BLANK IN FLIGHT., AFTER SEVERAL MINUTES THE UNIT RESET THEN REINITIALIZED ITSELF. DISPLAY FUNCTION WAS NORMAL FOR THE REMAINDER OF THE FLIGHT. R & R UNIT WITH OVERHAULED UNIT REMOVED SN M003633, INSTALLED M001484.