Gentlemen, Herrn Chevaliers, Q-Fahrer,
Actually the cam-lobe defects are a well known LC issue. Maybe formally right on BMW's behalf to decline warranty claims, but imho not fair.
To ClaudioM: If I were you I would browse the net for second hand part suppliers, in Germany, NL, and the UK there are several. (In the NL e.g. Beerens and Boonstra) And I would replace the cams and cam-lobe followers myself. You also will need new shims of adjusted size. There are YouTube tutorials for that. It's really a pity that bad luck struck you. You could likely have it fixed this way.
Good luck, regards, 1100liebhaber
(Mittlerweils auch 1200liebhaber uebrigens! :-) )