500 Hour Engine -- What Needs to be Done?

So we've reached 500 hours on our Lycoming O-540. All is well, and it
continues to run like a champ, using little oil. (Although we still have a
minor drip that's driving us nuts...) and pulling like a tractor.

So what needs to be looked at when 500 hours is reached? I know there's a
Service Bulletin to inspect the impulse couplers, but what else needs to be
done?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"