Yankee The only reference I can find to your question is:
M.A.803 Pilot-owner authorisation. Which is part of the NPA 2007-08 which is about to become law:
(a) The pilot-owner is the person who owns or jointly owns the aircraft being maintained and holds a valid pilot license issued or validated by a Member State for the aircraft type or class rating.
2. Pilot owner maintenance shall be performed by:
(i) the pilot owner.
(ii) in the case of joint ownership, the pilot owners designated by the registered owners of the aircraft being maintained or
(iii) where the joint owner is a limited liability company or a legal entity, by a pilot who is a member of, and designated by, that company or legal entity.
(d) The certificate of release to service must be entered in the logbooks and contain basic details of the maintenance carried out, the maintenance data used, the date such maintenance was completed and the identity and pilot licence number of the pilot-owner issuing such a certificate.
So not only will a pilot-owner be able to do some of the servicing, but he/she can issue a CRS.