If system charge is low enough that the compressor low pressure sensor won't let the compressor turn on at least for a short period of time, the system is near empty ( like 5% charge )
How do you know that the valves are leaking?
A fix for a leaking R12 style valve is to install a metal or hard plastic cap that has a gasket / o ring.
Valve change tools exist for the HVAC market.
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