I have the same issue as you. An extremely slow leak. We filled the system with Nitrogen all the way to 20 bar and after a few hours it was still at that pressure, however when filled with refrigerant, most is lost after a few days. We also put dye in the system, and we are unable to find from where it is leaking. I will be trying stop leak today, and recharge the system again, hopefully problem is solved.
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