As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, CREW REPORTED THE LEFT ENGINE OIL FILTER CLOGGED LIGHT ILLUMINATED. THE LEFT ENGINE WOULD NOT GO BEYOND IDLE POWER. AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. LANDING UNEVENTFUL. REMOVED AND REPLACED OIL DIFFERENTIAL PRESSURE SWITCH IAW AMM 79-35-01. LEAK AND OPERATIONAL CHECK GOOD.