Just my two cents worth here, but based on the concept that IMSB bearings fail because the trapped oil becomes acidic I'm going to guess that the corrosion on the front flange was caused by that same acidic oil while the car sat. Which further suggests your IMSB ball bearings may also show similar corrosion. If you dissasemble it, let us know.
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1999 Boxster Zenith Blue Metallic/Savanna Beige
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