One of his readers suggested that he use Deoxit spray to remedy the sticky button and it worked!
Deoxit is amazing stuff and something I suggest any radio enthusiast keep handy. Years ago, I had an Icom IC-735 I thought needed a new power button;I had to press and hold the button for the power to turn on. I searched for a replacement botton for weeks. When I reached out to a friend who is an electronics technician, he suggested that I open the chassis and try spraying the button with Deoxit.
I did, and it worked beautifully.
Deoxit is not the cheapest contact cleaner around, but it is the brand I trust the most. It comes in both a spray and liquid form.