Response to Penny
I wanted to thank you. After looking at the photos you attached, I went home and wiped off the label to see what I had. Mine didn't look like any of the pictures. Surprise! Someone had already converted it to an R134a compressor.
Bottom line is that I stopped by my favorite mechanic and he is going to recharge it with dye to find the leak and expects a very reasonable repair charge.
Sure beats the replacement costs I was being quoted.
Again, thanks for the help.