As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT OIL STRAINER CLOGGING LIGHT CAME ON IN FLIGHT, WOULD NOT EXTINGUISH WITH POWER REDUCTION. PRECAUTIONARY SHUT DOWN PERFORMED. REMOVED AND REPLACED MAIN OIL FILTER AND DIFFERENTIAL PRESSURE SWITCH IAW PWA AND DC-9 MM. OPS CHECKED GOOD, NO LEAKS NOTED.