Vista-mpx Torch Power Issue

We have a Vista-mpx ICP-OES. Recently we have been having an issue where the plasma torch has been noticeably dimmer and a power unattainable error keeps popping up. We've changed the RF coil, checked the argon lines, and the RF power is set to 1.2kW which has been fine up until now. What else can we try to get the torch running properly?

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