GE Energy Services is a division of GE and they can send someone out to perform the test. I have no idea what they charge, but they are putting together a quote.
I talked to the local switchboard company whose name the equipment bears, and he told me "just hold down the bypass button as you push test." When I asked him if that would perform a simulated or high current test, he didn't know "but it's all in the test log sheet, just read through."

It's one thing to push test and get a result, whether it trips or not. It's another thing entirely to know just how to interpret those results as they apply to the original problem. I'd feel better to have a paid expert on site to hit with a barrage of questions.

Thanks for the input. I'd still be interested in anyone's experience with similar equipment.