As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, MULTIPLE EICAS MESSAGES APPEARED. DUMPED FUEL AND RETURNED TO DEPARTURE. (DURING TROUBLESHOOTING FOUND CIRCUIT BREAKER C3140 (BUS 3 PWR SUPPLY) POPPED. FURTHER INSPECTION REVEALED BREAKER ASSY DAMAGED. R & R CIRCUIT BREAKER IAW & NBSP; SWPM 20-00. OPS CHECK OF BUS 3 WAS NORMAL IAW AMM 24-23-01. EICAS MESSAGES CLEARED.