I have an older 240V Balboa hot tub with a heating issue. The topside panel looks fine, when heat is required the heat light is coming on with no error codes. I am only getting 120V from one of the hot lines going to the heater, one of the relays on the board is not closing to allow the other 120V from getting to the other heater terminal. Does this sound like I need a new circuit board? and if so, do I need to replace it with exact same board or is there a generic one that may be cheaper? Mine board is a Spa Builders LX-10 Rev 5.31. Thanks, Craig.