Thank you for the reply and for all your work with the PhatBoxes.
You are correct, the first step is to determine if the plugin is even installed. Would that be in PMM under DMS hardware options, firmware setup tab, properties button next to click here to modify your firmware properties and install plug ins? I don't see anything there that indicates VIOT is installed.
I don't know if I will have much luck with the dealer. I bought the keg as-is and it was missing the original DMS cartridge (20gig?). It did include a broken 10 gig cartridge, and he did say he used the original DMS to fix another Keg (his own). If he had a 10 gig cartridge originally his own keg was probably not an Excelon.
I know that VIOT plug ins are mated to one Keg only. Is the VIOT enable change made to the DMS as well as the Keg internal firmware/NVRAM? Is there is some change I can make to my DMSes (VW 20gig, or hacked 80gig) that will reenable VIOT, assuming a plugin was installed on this Excelon at one time? Is there a way I can tell by examining log files or some other method to see if my Keg ever had VIOT enabled?