As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. JFK-ZRH FLIGHT RETURNED TO JFK. OVERWEIGHT LANDING UNEVENTFUL. DURING CRUISE, THE CREW REPORTED ELECTRICAL BUS AND CIRCUIT BREAKER PROBLEMS. REMOVED AND REPLACED THE BUS POWER CONTROL UNIT IAW AMM 24-41-03. OPERATIONAL CHECK GOOD.