As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DEPARTURE, AND AN EMERGENCY WAS DECLARED. DUE TO A LEFT ENGINE BLEED OFF AND LT PACK OFF. RESULTED IN CLOSING THE LEFT BLEED VALVE. RECEIVED A RT ENG HIGH STAGE MESSAGE AND LIGHT. STARTED DESCENDING DUE TO NO PRESSURIZATION.