Proform HIIT Pro Form elliptical stair stepper creaking squeaking sound

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Anyone have any ideas what to do to fix this?
At first it seems to happen when the arms/ feet are in the same location each time. (Note this is not the same location of the main wheel as t makes several rotations to get the arms to the same spot.). However, when I turn it backwards there is no creaking. And, when I then start rotating it forward again the creaking seems to happen at a different location of the arms/feet. Any ideas? 
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