I just received another replacement touch screen from:
eBay Member id: mingxing200808
FULL LCD Screen Display Garmin Zumo 400 500 450 550 79mmx 64.5m
Paid on May-21-12 / Shipped on May-21-12
He / She has done right by me twice now. A lot better than Garmin Support!!
YMMV, yadda yadda.
Thanks again to the folks that started this thread!
Ran Bush in Nor Cal