hi, i have a vita spa lc500. the topside control is 8 button Selectron. i popped off the cover to see whats inside. there appears to be a micro-controller, eprom memory, a chip to drive the display. it attaches to the power board with a 4 conductor cable. i've worked in electronics and i,am somewhat familiar with these parts. my question is---where can i get a detailed, in depth analysis of how this topside works. thanks.