Seeking Westfalia Control Unit - HELP!

[Caligrycho]

Hello you all.. I am in desperat need of a working Control Unit for Cali T4 - The Control Unit number is 62 236 001 and has a number under the plug 506 603 - Can anyone tell me where I can buy a new one - Anywhere in Europe??
Help would be much appreciated..

Regards Caligrycho