Well, I think I found the leak....I appears to be around the expansion valve. I could see the UV dye but there was much less than I expected......I hope this is the only leak....all 2.5 lbs have leaked out in less than 24 hours.....
Anyway, do the expansion valves go bad or should I just replace the O-Rings and reinstall it....The O-Rings do appear to be bad and the leaks appeared to be around the fittings....

While I have the system open I want to flush the ole oil and put in new oil....how can I do that and how much oil should I put back in?
Thanks
Brian

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1995 E300 Diesel
1994 E320
1999 C230K
1994 S500 W140
1990 300 SEL