Did you take an oil sample? had same thing last year. Oil looked worse than anything I had ever seen come out of a Recip. Oil tested came back with basically thrust bearing material in oil. Customer deciding on what to do a year later I guess they'll wait until the other two chillers stop working. Gives proof before you start job. You can transfer charge with G5 but you look like an amatuer. Get shop to make or buy transfer comp. Carrier sells one for High Pressure can be mounted on chiller or you can buy mounted on storage tank.