It was the power switch!
Also got a reaction from the Hegner service team that I should "hot wire" the power switch (with the necessary precautions of course!) to be sure it was the switch.
and luckily it was.
blew out the switch, no results...
did drench the switch with an electric contact cleaning spray and then blew out the residue.
let it dry and.... as new!
if you have the same issue, be sure when mounting back together everything, you look that the two wires from the speed control are well connected. these are short and one did came of. luckily I noticed before installing all back together.
so everyone thanks for the input and help!