It appears that Super8sound / PRO8MM used to repair the Nizos. Since they are re-making/modifying Beaulieus they are certainly in a position to repair the Nizos too.
In regards to the question about Nizo accessories, any of the 67mm wide angle converters can be used on the Nizos-- Canon, Eumig, etc. The battery packs are filled with nothing but Ni-Cads, these can be removed and recharged in any recharger. Just note which way they went into the original pack. There are 6 of them. Try out some DIN plug converter cables-- Calrad makes a few-- to see which will work with any stock earphone or headphone. The matte box may be harder to find, especially the really neat proprietary one. Try Halmar in Canada for a generic one, or maybe The Widescreen Centre in London can put you in touch of a Nizo specialist. Super 8 Sound in Burbank used to support Nizo but no longer.
ANDREAS---I recieved the email below (June 25, 2002) in reply to my question about Kurt Schacherl:
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"Hello,
As far as I know, Kurt Schacherl has retired.
I have very good contact to another repair shop, authorized for NIZO /
BAUER cameras and projectors. It is near my location (Ruhrgebiet) and
they do really excellent work. Unfortunately the owner wants to retire
at the end of this year.