As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DE-ICE BOTH L & R PACKS & L & R ENGINE BLEEDS OFF. L ENG BLEED DID NOT DISPLAY "OFF" NOR WAS A "L ENG BLEED OFF" EICAS MSG DISPLAYED .AC RETURNED TO THE GATE (BTB) AND MTX GROUNDED AC . TROUBLESHOT AND REMOVED AND REPLACED L/H ENG PRSOV IAW AMM 36-11-09. ALL OPS CHECKS NORMAL. ALL INDICATIONS NORMAL. NO LEAKS NOTED AT THIS TIME. A/C REMAINS NO ETOPS. AND AC WAS RETURNED TO SERVICE