As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CHIP COLLECTOR ON RIGHT ENGINE, NR 4 BEARING SCAVENGE LINE, CHIP COLLECTOR MAGNETIC PROBE EJECTED FROM CHIP COLLECTOR BODY. ENGINE OIL DRAINED FROM ENGINE IN-FLIGHT. ANALYSIS DETERMINED THE INTERNAL CHECK VALVE OF CHIP COLLECTOR WAS STUCK IN THE OPEN POSITION DUE TO DEBRIS LODGED BETWEEN THE INTERNAL CHECK VALVE AND COLLECTOR'S INTERNAL BORE.