i got an older (06-07) tub that does nothing. its got a balboa vs500 series control pack. wiring is good, the top side control is digital and has scrambled or no codes at all. which leads me to think voltage brownout on main board. my question,before i make a purchase, will a " viking spa control board (vkv500r) interchange with the balboa system? the boards look practically identical. thx in advance for replies.