As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DTW DUE TO LOSS OF NBR 2 ENGINE OIL QUANTITY AND PRESSURE. CREW SHUT ENGINE DOWN WHEN QUANTITY AND PRESSURE WENT TO ZERO. MTC FOUND ENGINE CONTROL ALTERNATOR DETACHED FROM AGB MOUNTING PAD. MAINTENANCE IN PROGRESS. (LP: 8844868. AIRCRAFT WAS GROUNDED)