PS Audio Ultralink Two buzz coming from the power transformer

Does anyone know what type of power transformer is in the PS Audio Ultralink Two HDCD DAC?  The thing buzzes audibly from outside of the unit.  I'd love to replace it with a little Talema toroidal transformer or comparable, but the transformer is cloaked in a cover that doesn't tell you the rating of the one that's in there.  Or has the window of opportunity of keeping these things alive long ago passed?  I like the sound of it, so I'm willing to do some work to keep it around a little longer.

Thanks!  Mark