As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 6823 -ATB- DURING CLIMB LOST LEFT AC BUS. LEFT BUS REMAINED ISOLATED. CORRECTIVE ACTION: T/S PER B757 FIM 24-20. ON ARRIVAL FOUND FAULT ON BPCU. CONDUCTED WIRING CHECKS. R/R LEFT BUS TIE BREAKER AND LEFT GEN BREAKER PER B757 AMM 24-22. REPLACED BPCU AND LEFT GCU PER B757 AMM 24-22. ALL LEFT AND RIGHT BUS SYSTEM TESTS COMPLETE, ALL TEST PASS PER B757 FIM 24-20.