Hi Frank:
If I may toss my oars into the water here, it looks like there are some overheated components on that control circuit board, so it would be my first suspect. It also appears to be older technology than 15 years, even though the system dates from 15 it could be a much older design.
Is the manufacturer still in business? Perhaps they can provide a schematic or troubleshooting tips, maybe even a repair/exchange on the control board. Armed with a good schematic you may be able to make voltage checks at various points to help isolate the problem.
I'm in So Cal and if you want to give as many details as you can you may email me direct.
Hope this helps!
Tony
edited for dyslexic spelling...
[This message has been edited by mxslick (edited 10-04-2005).]
