SIEL Orchestra 2 distortion, dead flanger

I’ve recently bought a SIEL Orchestra 2 and only after a later , closer listen did I realize that almost all ‘registers’ distort when played polyphonically. I tried both outputs, various cables and different volume settings, but the sound is the same.
To boot, the flanger doesn’t seem to take effect at all.
What could be the reasons and is it possible to find replacement parts that a local repairer could solve the issues with?

& another fishy detail:

What’s supposed to be there?

Thanks in advance for your answers!

your going to have to open it up and investigate more. There is more than one issue.