As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON LIFTOFF LOST 1 PHASE L AC BUSS, RETURN TO LAX. INSPECTED TB5003 AND TB5012 CHECKED OK. FOUND C/B C313 ON P31 POPPED FOR L BUSS SECT 1, REPLACED C/B RAN BOTH ENGS C/B C313, OPS CHECKED NORMAL. CHECKED OUT WIRES FROM C313 TO TB 5003 AND TB5012 FOR CORRECT PLACE CHECKED NORMAL PER EO 6-85121-3. REMOVED AND REPLACED LT FUEL OVRD BOOST PUMP CONTROL RELAY K10011, OPS CKS NORMAL.