As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 OIL BYPASS LIGHT CAME ON. COMPLIED WITH RED TABS AND SHUTDOWN ENGINE. OIL PRESS AND TEMP NORMAL. *S/D* CHANGE FILTER PER 727-100 MM 79-00-000-2, CHANGE OIL PRESS DIFFERENTIAL SWITCH AS PRECAUTIONARY DUE TO HEAVY CARBON BUILD UP ON FILTER PER MM 79-33-002-4. RAN ENG PER JRH NO LEAKS NOTED AND ALL ENG PARAMETERS NORM.