had my rear diff fixed almost 2 weeks ago when it started making whining noises while on 5th letting off the gas @ 90 kph. last night and tonight (dunno if its got anything to do with the rain) but now there is massive whining noise at the rear while cruising down the freeway at 100ish. just got my turbo recently done and thought it could be the turbo spooling but it still whines doing 80 - 100 while on neutral. is the rear diff screwed again ? and would subaru fix this under warranty when I have changed the turbo ? thanks in advance..