Who is performing this service ? The line he is referring to is the liquid (capillary tube) suction line which is welded together for proper heat exchange. If that is the case then this should be addressed by the manufacturer. Was the system properly evacuated and a new drier installed ?
Was the condenser clean ? The newer refrigerants along with overheated systems cause any moisture in the system to release salt which mixes with compressor oil. This sludge clogs up the capillary tube stopping refrigerant flow.
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