Thermador Cook'N'Vent hood won't retract

I have a Thermador Universal cook’n’vent cvs36R. The hood will not retract. I am trying to figure out which part I need and how hard it will be for me to repair it myself.

I already tried cleaning the unit (which was dirty) and flipping the house breaker switches. The fan does work, but the vent retracting system does not.

Any help you can give me will be greatly appreciated!

I have same problem Did you resolve?