As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT GEN OFF WITH LEFT BUS TIE LIGHT / ISLN LIGHT ON WHEN POWER ADVANCED FOR TAKEOFF. A/C ABORTED TAKE OFF (ATO) AND RETURNED TO GATE (BTB). MTC DEFERRED LH GEN IAW ABX MEL 24-00-1-2. GENERATOR DISCONNECTED MX PROCEDURES ACCOMPLISHED. PLACARDS INSTALLED. A/C RELEASED ETOPS 120. A/C RETURNED TO SERVICE.