Anyone familar with Zender in Germany?

I am trying to do research on my 512BB which was modified at great expense by Zender sometime in the 80s, my car was also a German car owned by Schumacher Racing before the mods as well.

I have contacted Zender over a year ago and they told me all old records were lost from a plant fire but this was via e mail and probably some secretary that could care less, I know its a long shot someone may be around still that modded my car and know specifically what they did but in any case I can't find any info on what Zender would have done to the car, clearly they did bodywork but I don't know what they would have done as the car is returned to stock appearance, they also redid the console and dash which remains, I can't bring myself to return it to stock as it looks nice and the leather is of superior quality to stock. I am also curious if they would have done any engine or transmission mods to the car.

The serial no is 24445 and its a '78

Any help would be greatly appreciated

 

cool,

thanks