Chip replaced, radio works perfect . We still have 10 degrees Celsius, so I will wait for lower temperatures, but the old chip was making problems also at these temperatures. So I can highly recommend the link above and the company that sells it. Communication and shipping are perfect.
Though, just a precaution: the replacement was not so easy as I though (10 minutes max). I had it done by man who knows electronics very well and it took us 1,5 hour, because we had to dissassemble the radio to have enough space around the chip. But true, he is perfectionist, and he worked slowly and carefully. Hope this means that for next 10 years there will be no volume problem .
Though, just a precaution: the replacement was not so easy as I though (10 minutes max). I had it done by man who knows electronics very well and it took us 1,5 hour, because we had to dissassemble the radio to have enough space around the chip. But true, he is perfectionist, and he worked slowly and carefully. Hope this means that for next 10 years there will be no volume problem .