Nothing at all on this Dan, Panasonic seem to keep this sort of information to themselves and bike manufacturers. I've tried communicating with BikeTech who have used these units for years on their bikes, but they just don't respond, possible due to language difficulties, since they are a German speaking Swiss company.
One problem is that the electronics on these are far more than just a controller, the complex mainboard being more in the style of a computer motherboard complete with a central processor performing a wide range of functions.
Mainboard
.