Shine a flashlight by the flapper and see if any gaps are present. A common thing is to have broken/cracked mounting tabs on the door which will cause the flapper to be all loose. They make this kit for that condition: Part number: ap3872692
By your statement it does sound like you could have a main control problem. You will only be able to confirm by checking your input and output voltages on the control fir the components not working correctly.
It may be the motor but, I've encountered a few of these where the fan blade seems to walk back on the motor shaft to the point where the back of the fan blade makes contact with the motor causing the noise.
The fix has been to pull off the fan blade and put a small spacer (usually a copper ferule) on the motor shaft between the blade and motor.
I recall working on one of these that would very intermittently stop cooling. It would not go into diagnostic mode, or more accurately it would not go all the way through diagnostics. it ended up being the infamous control board.