Is there oil leaking from the bottom of any of the rocker arms (especially toward the front)?
No, the only place I see oil emerging from the rocker arm assembly is the holes on the rear rockers. Thanks for the tip on the end plugs. If using a wire in the holes doesn't do the trick, I think I'll next try to remove the front end plug to check things out. I'm assuming I can do that without taking the entire rocker arm assembly out.