I have been to the factory and received some training. However, capsule issues cannot be handled anywhere else but the factory which has dedicated purpose built rigs for testing (they were built decades ago) which Schoeps cannot sell to anyone.
I have done some repairs here in India and do have a set of spares etc. However, the humidity issue is something related to dust on the diaphragm as well which is very difficult to clean and only the factory can do it.
-vin