As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM AS A CONSEQUENCE OF L OIL STRAINER CLOGGING LIGHT TURNED ON. THE ABNORMAL PROCEDURE WAS PERFORMED AND LEFT ENGINE WAS SHUTDOWN. THE FILTER AND SWITCH PRESSURE FILTER WERE REPLACED IAW 72-61-54 AND TEST CORRECT IAW MM 79-35-01.