PCA has released a video in which Jake Raby of Flat 6 Innovations talks at length about the IMSB issue. I think it worth a viewing if you want to come up some speed on this IMSB business.

Here's a link:

https://www.pca.org/news/2017-11-21/...ring-explained

Might point out that at 127K miles I think you have one of the good/better bearings. The early Boxsters (and 996's) came with the double row bearing which has the lowest failure rate.

(My 2002 Boxster, with I believe a single row bearing, has gone over 315K miles so the single row bearings can hold up well, too.)

But of course it is up to you if you want to have a bearing upgrade installed. Then you need to decide which one.