http://www.regles-osac.com/OSAC/fascicules.nsf
wigglyamp.
I don't have an EASA/OSAC approved PA28 maintenance programme to hand, but it's not all gloom & doom ... for example it is still possible to run Lycosaurus engines beyond manufacturers TBO under OSAC/part M rules.
See:
Partie 4, P-41-40 Moteur a pistons, temps de fonctionnement.
Beware CAA surveyors 'gold plating' when reinventing the wheel by 'developing' yet another quite unnecessary maintenance programme.