I only replaced the Res as part of preventative maint. The fluid level was low, but no apparent leak. The top of the system is clean. Not a drop on the alternator. Most of fluid leak is on the drivers side when looking under the car. It is dripping off the frame there.

These seals that go bad. Are they easily replaced? Or do you need a rebuilt unit?

I wish I never had changed fluid. I was planning on doing the transmission fluid and filter next, but this has given me pause. Tranny is fine, maybe I shouldn't mess with it.