Detlef,
I owe you an apology. I originally deleted your last post because it's not RV-related. However, it involves jobs and Doug likes those: I should not have deleted the thread. We'll keep this one active, Sir. Good luck with your search.
The FAA also has the DAR Directory available on their web site. Please note, there are FSDO and MIDO DARs listed in different sections of the publication.