My thought process ... 1st I'd check the quality / colour of the diff oil. After 85k mine looked almost new. I've not come across my diff issues here. The colour might give a clue to the diff state. There's more metal bits (bearings n gears) which are more prone to noise than the hydraulics in the haldex which is just a series of clutch plates which at the right time join the front back prop to the rear diff. As u are under there check the state of the haldex oil. Mine was horible and I flushed oil through 5+ times before I started to look reasonable when removed. One thing I learned is volvo wanted 10 hrs to remove the diff ( 2004 v70 AWD R) my issue was haldex dem not rear diff.
Sorry don't know any 3rd party repairers.
Good luck..
Cheers Bob.
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