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You need to pressurize the system with nitrogen and four oz of R22 and use a sniffer to check for leaks...
EPA rules allow you to use this and vent to check for leaks.
if the leak is at the front of the compressor that may be all that needs to be fixed..
but you do not have enough info yet to make any long range plans or conclusions.....
Avoid running your AC because all your lube for that compressor comes from being mixed with the refrigerant...which looks to be basically gone.. when you take readings always post them if you refer to them in the post... ' low' and other things are subjective ...
read the reference thread in my sig listed last.... report back your leak results...
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