Hello Stu thie MMIC is placed on the A15 board the is the lowest on the analyzer. It is below the screens on the PCB. I will look dokumentation if I still can find it.
I suspect you might be able to rent the TAM from one of the ETE rental outfits for a month or so for not a horrible price.? I believe that Tam Hanna has one or two for sale, I may purchase one from him for my own use with my 8562A.
Don Bitters