Whining hot water heater

Update. Went to the dealer today and offered to buy a new circuit board to see if I could get one that was quieter. My very good dealer parts manager lent me a new circuit board. Went home, plugged it up, and it was a little quieter, but it would not start the gas heater! I got the whine on gas or electric (electric was working-I can tell cause the AC lamp dims when the electric element comes on). So, I'm going to give it back tomorrow. Obviously I feel bad, because it will look like I somehow damaged a brand new circuit board, but it's a pretty simple install, and it didn't damage my board to put it back in. Anyway, while fooling around with it, it became obvious that when the board is not screwed down, it is much quieter, enough so that you cannot hear it inside. It appears to be transmitting the high frequency whine through the metal enclosure. I tried putting rubber washers between the board and the metal surface, but it did not help. If you just unscrew the board, and pull it out a few inches, and angle it away from the edge, it gets much quieter. The noise is coming from the 1" by 1/2" component that is immediately to the right of the round terminal that the heat sensor plugs into. (Bottom left corner of board). I tried other methods of insulation, but none were successful. I have some ideas to try, and will report if successful. I've had 15 RV's, and all but one had a gas/electric water heater. I've never heard this sound before. I did notice the board said made in China. Don't know how long this has been the case. I suspect it has a lot to do with the location of the water heater. If it's under a cabinet that's open to the interior, you're more likely to hear it.

CT51