If you take it back apart you need a new Receiver - dryer.....
actually ...if you know you have had a leak the system should be considered compromised and get a new R/D...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

I remember that the A/C did have a leak at the front of the unit, although I was told it was very minor....

Think its a better choice just to replace the compressor and be done with it?

Current compressor is FourSeasons -- replaced somewhere between 1999-2003 (sticker still on there, although not filled in). How comparable are they are Nippodenso?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

If you are going to have the system apart anyway...and can afford to replace that old a compressor I would sure do it... think about what time and cost ... perhaps a couple of years out... would possibly be saved... and the fact that these things seldom happen at ideal convenient times... like on a vacation trip far from home and your AC tools.... or your favorite trusted AC shop....
Those compressors WORK HARD....

__________________
1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html