I think you have option 089, or at least some of the required hardware. I see an R-channel switch in your picture. It's that gold plated microcircuit between the wide rainbow-colored ribbon cable and the lone step attenuator.

This is a great analyzer you got, the only problem I see with it is that someone tinkered with it and now you have to retrace what they did. I don't remember off-hand what all the other switch positions on the processor board do. I will look later and let you know.
What do you see on the screen when you first turn on the analyzer (make sure the analyzer is set to boot up in "Preset: Factory" and not "User")? Which options are listed on the screen? Does the serial number on the screen match the number on the rear panel label?
Vladan