Oil leaking from differential on Volvo V70 XC

Oil leaks from the AWD differential have been reported.
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Average mileage: 215,500 (166,000–265,000)
Drive Train affected: AWD
2 model years affected: 1999, 2000
4 people reported this problem
problem details
2000 Volvo V70 XC 265,000 mi,
High pitch whine coming from differential. when I investigated the sound I discovered that the differential had been leaking and was nearly out of oil. I topped off fluid but sound is still there. I do not know what the source of the sound is yet.
1999 Volvo V70 XC - AWD 166,000 mi,
Oil is leaking from the differential. I smell it burning when the car is running for more than a few minutes. I just bought the car. I diagnosed it with a mechanic after we drove it and also ran it while up on a rack. It has not been fixed yet.