As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT FLT 885 EN ROUTE CLT TO CUN. LEFT ENGINE LO OIL PRESS LIGHT. LEFT ENGINE OIL QUANTITY 0. COMPLIED WITH QRH PROCEDURE TO SHUT DOWN LEFT ENGINE. FLIGHT RETURNED TO CLT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE. ALL ENGINE OIL EXITED THROUGH SCAVENGE TUBE BEHIND RADIAL DRIVESHAFT THAT SEPARATED FROM FLANGE. THE TUBE SEPARATED DUE TO FLANGE BOLTS THAT VIBRATED LOOSE.