As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW NOTED OIL PRESSURE WAS IN THE AMBER. CREW RAN QRH, SHUTDOWN ENGINE NR 1 AND DECLARED AN EMERGENCY. LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND AN O-RING BROKEN ON NR 1 ENGINE OIL PRESSURE SWITCH. MAINTENANCE R & R OIL PRESSURE SWITCH IAW AMM AND OPS CHECKED GOOD. ACFT IS GOOD FOR SERVICE.