I took off the control panel and looked at the backside of all the mode select push buttons. I noticed that the power button connection had three points where it was soldered to the control panel. One of the connections appeared to look kinda rusty. I took a soldering iron and carefully heated up the old rusty solder, wiping it away with a toothpick. Then, I refilled the joint with some fresh electronics solder. I don't have much soldering experience at all, so it wasn't pretty. But it was easy enough. And now it has fixed the issue. I am thinking of taking some hot glue or silicone and covering the solder points to protect them from the moisture.
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