As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI UPON COMPETITION OF ENGINE START WE RECEIVED AN EICAS L ENG BLEED OFF ,AC REURNED TO THE GATE (BTB) AND MTX GROUNDED AC , EXERCISED PRSOV VALVE (L/H) CYCLED CARD LH ENG BLEED AIR, OPERATIONAL TEST GOOD IAW AMM 36-11-00. RAN LH ENGINE NO FAULTS NOTED OPS CHECK GOOD IAW AMM 71-00-00 A/C REMAINS NO ETOPS AND RETURNED AC TO SERVICE