KLowe, back to your original problem--what was (or is) the matter with your figure-8 capsule, and has Neumann USA been able to help you with it? I'm just curious because I don't think that their U.S. facilities are equipped to do any response testing on microphones or capsules other than by ear, and Neumann in general stopped repairing capsules years ago--if one of their capsules has a serious defect, they replace it.
KM 100-series "active capsules" all share a common assembly which contains the front end of the amplifier circuit. In the event of a failure in that assembly, it (at least theoretically) could be repaired or replaced separately from "the capsule part of the capsule"--but I'm not sure what their policy is about that these days. (The only repair problem I've ever had with my KM 150s was a bad spring contact in one of the amplifiers, which prevented it from working with extension cables or their almost-right-angle swivel joint.)
--best regards