if you don't have luck with phoning the Düsseldorfer Archiv or with writting an email... You can tell me which documents you need and I can send you images of these records. I am living 25 miles from Düsseldorf. In the past I helped many peoples with their searches. But I am not able to do this for free any longer, but for a really small amount of money (you can use paypal to send your money safe and fast).
If you want my service, please contact me: www.decipher-german.com