As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYC - INFLIGHT DFW-NRT. CREW REPORTED LEFT ENGINE LOST OIL PRESSURE. LEFT ENGINE WAS SHUTDOWN SINGLE ENGINE TIME 20 MINUTES. EMERGENCY DECLARED DIVERTED YYC LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FLIGHT WAS FERRIED TO DFW FOR REPAIRS. REPLACED LEFT STEP ASIDE GEARBOX AND OIL PUMP. SYSTEM GROUND CHECKED NORMAL OPERATION.