The two o rings in the valve need to be replaced and will solve your issue. They are a common wear item in the valve and need to be replaced with use. Replacing the o rings is is a fairly simple task but requires removing the lines from both valves, and removing the valves to replace. You will need o rings for the valves bodies as well as backing rings and o rings for the lines. Mc Master-Carr sells everything you need cheap in quantities of 100.
Oil-Resistant Buna-N Backup Rings
0.053" Wide, for Dash Number 011
5288T117
Oil-Resistant Buna-N O-Ring
1/16 Fractional Width, Dash Number 011
9452K19
Oil-Resistant Buna-N O-Ring
2.5 mm Wide, 11 mm ID
9262K234
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