I resolved the problems with track power as follows:
the bolt in the center of the turntable is the rotation shaft that can be removed with a flat head screwdriver. There is a nut under the turntable (don't loose it). this allows the to part of the turntable to be lifted up. there are two spring loaded contacts for the outer rails (they will fall out when you lift the top of the turntable off).
I was able to reassemble the turntable with these contacts in place, by using some "red & tacky" grease to hold them in place when the turntable is reassembled, preventing them from falling out of their contact seat in the moulded plastic top.
The dead center rail was due to a contactor clip being broken. I soldered some wire between the center rail power clip and the center rail, restoring the contact. This would would make the easy transfer from 2-rail to 3-rail more difficult, (as the soldered wire would need to be removed), however this is not an issue as I will only use the turntable for my 3-rail operation.
I hope this post will help anyone with a similar problem, as this broken center rail tab came from the factory, new out of the box turntable.