As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE CREW REPORTED THEY LOST NR 1, 2, AND 3 DISPLAY UNITS ALONG WITH THE FLIGHT DIRECTOR AND NON-ESSENTIAL BUSS 1 FAIL. THE CREW PERFORMED AN AIR-TURN-BACK. MAINTENANCE REPLACED THE 1VE PANEL AND WITH OPERATIONAL CHECKS GOOD THE AC WAS RETURNED TO SERVICE. NOTE: THIS 1VE PANEL WAS JUST REPLACED THAT DAY TO ELIMINATE AN APUAND DC POWER PROBLEM. (K)