Wow, this is a monster... built like the proverbial brick outhouse. It must weigh 60 lbs at least. So, picked up the 8133A, got home and powered it up to see what happens, if there are any beeps, POST messages, fans come on, whether it responds to GPIB, etc.
It comes on. I poke around a bit. It works fine. Checked some low frequency stuff with the scope. Will check 1-3GHz output with the counter. Perhaps it has some problems with certain kinds of outputs or something. Keyboard seems okay, not too snaggly.
So I'm leaving it running for a few hours to see if it has any thermal issues. Then will open it up and give it a good cleaning, check caps, etc. I bet it either had a loose connector that resettled during transport (or because I stood it up sideways perhaps) or some other trivial problem.
Well, that has worked out alright so far.