Ok!
I fixed all 4 windows by ordering the parts over the net for less than $350.
GM - Buick claim there is no problem with their windows - but just Google it!
WOW on the Buick! First Wife drives her beloved 1995 Buick Riviera and we have had one window problem on it BUT we are wanting to test drive a Lacrosse if the dealer in Podunk Ca ever gets one. What were the components that failed?