Our GDB277PDB7 had a similar issue - but no power outage. It just beeped 3 times, then the panel died. Also 5 years old. A factory service technician came out and said the control panel needed to be replaced. Actually the ticket says "Sub CNTRL-EL". The part from them is more than 2x the price here, if I'm looking at the right one, and I'm sure I can do it myself. But... based on this post - thought maybe it's not the control panel at all. The transformer isn't too much $ to give a try first. But the "circuit board" part (AP3767567) and the "control panel assembly" (AP3131956) are pricier and I don't think I can return one if I try it and it doesn't fix the issue. I'm thinking circuit board, but just looking for a suggestion/confirmation on which I should try. Thanks!
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