As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIV- IFSD OF NUMBER 1 ENGINE DUE TO OIL LOSS. CREW REPORTED QUANTITY DROPPED TO 9 QUARTS. FLIGHT MADE AN EMERGENCY LANDING IN DSM. TROUBLESHOT AND FOUND #4 BEARING SCAVENGE TUBE B-NUT LOOSE. CLEANED INSPECTED AND REINSTALLED LINE. PERFORMED WINDMILLING INSPECTION. PERFORMED HIGH POWER RUN ENGINE LEAK CHECKS GOOD. (LP# 7965538, 7965539 )