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Hope this helps, it is possible atleast with arctic spas, I just dont know how it is done.
It may be possible but could void the warranty.
Your dealer should provide that information
Do not pay attention to the wimps and neysayers.
I changed my 365 before I even put the water in by moving a jumper on the board. It will go to 108. Do not pay attention to the wimps and neysayers.