2009 Mazda6 Whining sound between 1500 and 2000 rpm...Help

Hi,

First of all, good forums to everyone.
In my 2009 model automatic transmission Mazda 6, there is a whining sound like in the video between 1500 and 2000 rpm. This only happens while driving. Has anyone experienced this problem before?
It has become very annoying and I can't find the problem. I don't want to make unnecessary expenses. The masters say that the engine will be built or the gearbox will be dismantled. They say that if there is no solution, you will have spent in vain.
 

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