Counterpoint Natural Progression Turn On Problems

I have a Natural Progression NP 100 Gold Upgrade amplifier that will not turn on. When working properly, from the stand-by mode, you press the power on button, it goes through some type of verification process and then after a minute or so it turns on. However, since three years ago, and in the summer only, it would sometimes end up not turning on or taking much longer than ususal. I chalked it up to possible brown-outs, but it has gotten progressively worse and now will not power up from stand-by at all. I have seen a similar one for sale with the caveat that it wouldn't turn on when the temperature was above about 72ºF. The owner put ice packs on it to turn it on when that happened. I have not tried this. Does anyone have any idea what can be wrong (ie thermal protection circuit?) and who or where can it be fixed? I now live in Europe so if you have any clues for overseas repair, great, if not I'll have it sent to the US. Thamks!