Major thanks to the xda brethren. Especially dibb_nz, Vache, Jasto, Civato, Scrilax,eppeP, blacthund3r, Moscow Desire, and Timmydeans. I have snatched another A500 out of the jaws of despair. It looked like the tab had a motherboard failure, but ...
I am undertaking doing this my self. I will be using some graphite conductive glue. I'll let you know how things go.