This document summarizes an investigation into recurring bearing failures on a vertically mounted grinding mill. The mill uses three bearings: two cylindrical roller bearings and one ball bearing. The ball bearing type was changed in 2007, from an SKF 6316 C3 to an SKF QJ 316 N2MA. This new bearing had a cage that prevented adequate lubrication, leading to repeated failures. Replacing the ball bearing with the original SKF 6316 C3 type resolved the issue. The importance of thorough documentation of equipment history was demonstrated, as it allowed analysts to identify the bearing change as the root cause of failures.