Test indicate power is getting to Aquarite Goldline AQR15, but LED on Display Board indicates no power. Test shows no electricity in red, black & orange wires between Main Display Board & terminals on the back of the box. The one yellow wire between the transformer & a terminal at the back of the box also shows no current, but the other yellow wire between the transformer and the Main Display Board shows current. Have replaced Display Panel, but no change. So . . . do I need to replace the entire Main Display Board? The transformer? The fuse? Or all of the above? Suggestions about how I should proceed most welcome.