Disco 3 Diff Problems

[Coolcat]

Hi, I've just had my Discovery 3 in for a 40,000 km service and was told that both my diffs are shot and need replacement (under warranty....just). The dealer advised that the diff fluid/lubricant was contaminated (metal particles) and that "we've had a few of these". A chicken and the egg situation, did the diff fail due to contaminant or is the contamination due to the failure??
Regardless, I was wondering if anyone else has heard of this issue or it's cause??
Thanx, Coolcat

[Scouse]

The contamination is due to the failure, possibly pinion bearings.

He shouldn't really have told you that "we've had a few of these" though - there's a script for this sort of thing that goes along the lines of "gee, that's unusual. Never seen one of these fail before" :wasntme:.