[msinc]

I am happy to report that I believe I have the leak located, corrected and back in service!!!! The reservoir is a two piece unit and it does have an o-ring. Mine also had a lot of casting flash in the groove where the o-ring rides. It left two impressions on the o-ring itself about 180 degrees apart that I believe was the culprit.
Once I got an inspection mirror and got a good look at things it was pretty apparent that the reservoir itself was the leak. I removed it and did an internal inspection to find the o-ring flattened and with the two marks pressed into it pretty good. See attached photos for close ups of the casting flash and o-ring. I turned the o-ring inside out so I could photograph the damaged section. The bore that goes over the o-ring was nice and smooth so it didn't appear to need any attention.
I used a small smooth file to remove the casting burr and smooth up the o-rings groove. I got a new o-ring, which is a common {nothing special} part available at the local auto parts store. I reassembled and re-installed it earlier this morning and it has been leak free for several hours now. I also applied a little silicone grease to the new o-ring and it's groove prior to assembly to avoid any damage to the o-ring before I put it together. Following Blas' suggestion on the hose, it was in fact "pressed" and marked pretty good by the clamp that seals it so I simply cut it back to good hose behind the clamp area and reinstalled it. So far so good, but it really was a slow leak and if it reappears I will post the bad news. Thanks again for all the replies and info!!!!!!!! M