As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GUM - FLT 919 - L/P 7912625 - AFTER DEPARTURE, ALL FUEL FLOW INDICATORS WENT TO ZERO. AIRCRAFT RETURNED TO GUAM. AFTER TROUBLESHOOTING, THE AIRCRAFT FUEL FLOW POWER SUPPLY UNIT WAS FOUND AT FAULT. FUEL POWER SUPPLY UNIT WAS REMOVED AND REPLACED WITH SERVICEABLE UNIT. AIRCRAFT DEPARTED WITHOUT FURTHER INCIDENT. (X)