Whine

Probably the grease in the throw out bearing starting to go dry.
Do the throw out bearings have a zerk fitting? I just started to have (what I believe) the same whine noise. I hear it in reverse and in 1st gear.
I remember greasing throw out bearings on big rigs as a kid working on my family's truck yard. Not sure if the 833's are the same.

thanks
danny