As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE OIL PRESSURE EICAS MESSAGE FOR FIVE SECONDS ON CLIMBOUT THRU 8000. OIL PRESSURE READOUT FLUCTUATED BETWEEN 26-45 EMERGENCY DECLARED RETURNED TO DEPARTURE, SHUTDOWN NR 1 ENGINE ON GROUND DURING TAXI. SERVICED LT ENGINE IAW AMM 12-13-79. NO DEFECTS NOTED.