Interesting post. Sorry to bring up the experience, but having the same issue.

Replaced the broken blind but with a genuine Volvo part. Packaged and all, alas M mode does not engage.

Aside from trying another unit, any other recommendations?

Looking to see if anyone has had any experience with this interesting leak

Appears to be coming from a rusted out plug at the bottom of the haldex above the rear diff crossmember.

Thoughts that are not extensive/expensive repair are welcome.