As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, LEFT ENGINE START VALVE DISCREET LIGHT ON. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE ACTUATED START VALVE IAW B767 AMM 80-11-02 DUE TO FAILED START. NO FURTHER DEFECTS NOTED A/C REMAINS NO ETOPS. AIRCRAFT RETURNED TO SERVICE.