it's the cam seals.
if they aren't done with the timing belt, they will leak in time.
thus you have a bleeder.
i do too.
i'm gonna fix mine in two weeks when i'm back in NC.
while you're in there, make sure to change all 5 seals, that way you won't have to go back in.
use either a felpro or OE seal. the rest will still leak like a bish.