As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE TO DCA, THE CREW RECEIVED A LEFT HAND ENGINE PRESSURE INDICATION MOVING INTO THE AMBER RANGE. THE CREW DECLARED AN EMERGENCY AND FEATHERED THE LEFT HAND ENGINE. THE CREW THEN DIVERTED TO LGA. OUTSTATION MAINTENANCE INSPECTED AND RESHIMMED THE OIL PRESSURE REGULATOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 79-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.