As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS ALL ENGINE OIL QUANTITY FROM NR 1 ENGINE OIL SYSTEM INFLIGHT. PRECAUTIONARY SHUTDOWN, CSD DISCONNECTED. ENGINE MAINTAINED OIL PRESSURE GREATER THAN 5 PSI AFTER SHUTDOWN. FOUND CSD INPUT SPLINE OVER FILL STANDPIPE CAP LOOSE. SECURED CAP AND PERFORMED ENGINE INSPECTION PER P&W MM 72-00. NO DEFECTS NOTED. RECONNECTED CSD. ENGINE RUN GOOD.