On Mar 4,  7:44, Tom Uban wrote:
  I've seen a number of the rectifiers fail, so I
would concur that it
 is a common component to fail. Also, those supplies have always
 whistled, even when new from the factory. 
Well, I've seen a few that don't whistle, and I don't really think they
should; the coil laminations are supposed to be glued together and
encapsulated.
--
Pete                                            Peter Turnbull
                                                Network Manager
                                                University of York