From an email exchange with Jeffrey Jonas in October 2009:

I salvaged some GAP/R K2-W and -P modules from some servo-motor lab that was being discarded.

>The source of your K2-W and K2-P is intriguing. Would there be any materials showing how these modules were used in the lab?

Sadly, that was nearly 30 years ago in a lab that's long gone in a building that's now vacated.

And recently, Professor Richard Gray Costello died who might've remembered it and saved something.