I had Volvo replace mine at last service, its just the out part you get and not the tailgate part.
Water ingres seems to be a problem. mine had a small lake in the bottom when it stopped working. After it was replaced no more problems. it was also an off the shelf part in stock, rather than having to order in.
The part was around £400 and the rest was labour as the back bumper and the interior quarter panel trim is removed during replacement at the dealer.
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Now 2017 Volvo V90 D4, Grey, one owner 59K miles
Was 2003 Volvo S60 D5, Blue, one owner, 199K miles.
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