Well I went ahead and pulled the chassis. I removed the picture tube to clean up the chassis. I noticed that the 5Y3 rectifier was missing.
The transformer is a replacement. It is a Hammond 28387. There are leads that have been clipped from the 5Y3 tube socket. It has been removed from the circuit entirely. The 5U4G is wired properly. The original (transformer) must have smoked. Any thoughts on why this was done ? There is also a metal can (electrolytic 80 mfd) installed in the "hole" that seems to be "open" on other 810 models I've seen in Bob's videos (where there is none installed).
Tony