I have a good friend with a 2000 Sundance Marin 850 spa. A spa company replaced the PCB board and failed to set the jumpers to the same as the old board. The schematic in the owners manual does not show how to set the jumpers depending on what options are installed in the spa. A call to Sundance revealed they do not offer tech support. They said they just assemble the units with their shell. Evidently some of these jumpers are used to set the type of circulation pump in the spa. I have searched high and low but to no avail. Can anyone help?