Well I just removed stock DV and uncovered disaster. The black plastic housing ring was loose and the blue retaining ring was missing from the DV. Shined a light into turbo only to find scored and bent blades. What a bummer. The plastic pieces must have been brittle/weak from reinstalling them on a couple different DVs. The broken pieces got sucked in and killed the blades. Bearing still feel good, and there's no shaft play. Might be able to have it rebuilt. Bummer.