Thanks to 3U for pointing to me toward the R428 potentiometer. A small adjustment did the trick!

For those that have a hard time finding the potentiometer, here is a link from DG Flugzeugbau that shows the location of the said potentiometer.

http://www.dg-flugzeugbau.de/Data/TN.../1997-20-e.pdf

Thanks,

Bastoune