http://mz-faber.de/MZWeb/News.aspx
For all years of the MZ-1000 models S-SF-ST
Goodwill Service: Fixing the oil pump and timing chain guide
MZ factory release date: June 16, 2011
From 1 October 2011, the MZ-service actions are no longer with us will be charged as a guarantee or refund performance. The vehicle owners pay for it and for all consequential damages from the engine itself 10/01/2011 Zschopau GmbH bears no responsibility for the failure to complete the service action, since each MZ-dealer in 2009 in various ways has been informed several times about it!
I've contacted Grahams about this and they are getting more information from the factory.
Sounds like only German dealers may have been contacted.
I post more info once known.