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I've been looking into retrofitting my 740 to R 134a, I spoke with a local shop who as converted a few of a friends Mercedes and claims to have converted about 100 other cars, this was his advice: Don't flush the compressor when I've flushed compressors they've seized up so I just leave them alone. I don't replace o-rings unless I disturbed a fitting. Have a look at this article from EPA regarding 134a conversions, thier guidelines seem to match what he is saying. If your system is flat or leaking you may have corrosion around o-rings or other problems which would require attention but if not then changing the receiver, pulling the system down and re-charging with 134a may be all that's required.
Written by EPA's Stratospheric Protection Division
Last updated on January 8, 1998
http://www.epa.gov/ozone/title6/609/retrguid.html
Tim
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