Grundig Satellite Recorder 4000 - Special Guy wanted for Refurbishing

At the last repair cafe (a facility where repairs are carried out free of charge and on a voluntary basis) where I work as a repairman, I had for check this multi band/SW receiver with integrated cassette recorder:
http://www.grundigradio.de/Grundig-Satellit-4000-details.html

The cassette door with insert cassette doesn't go longer open by press the associated knob.
After dismantling, removing the remaining belt and turning the flywheel by hand, I was able to unlock the cassette door and remove the inserted cassette (with a broken tape). Additional I discover a broken plastic gear (yellow-transparent).

Therefore I decided not to attempt any try for repair and to leave it to someone who has practice and experience with this model and its specific deficiencies (check out the images uploaded here, which I took from a site in the Far East, encouraged me in the decision not to attempt any further repairs).
That's why I'm posting this here to find out a good repair address in European Union or Serbia for the owner of that device from Grundig.

Grundig is known for the fact, that repairs to its cassette deck units (even as single component) from the late 70s and 80s
that a repair resp. refurbishing work can only be carried out successfully with help of replica gears (which are available from various suppliers on eBay).

Maybe someone knows a specialist who is particularly familiar with this Grundig model - thanks for your information.
 

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