As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, LEFT S/G FAILED AFTER ENGINE START. RAN QRH. ALSO OCURRED FROM GROUND POWER TO APU. AIRCRAFT RETURNED TO BLOCKS. (BTB). DEFERRED LT S/G IAW MEL 34-22-5. REMOVED AND REPLACED LT SYMBOL GENERATOR. OPS CHECK GOOD IAW B767 AMM 34-22-01. DI CLEARED. A/C REMAINS ETOPS 180. AIRCRAFT RETURNED TO SERVICE.