Hi,
I believe you are referring to the inspection plate. Is that correct? The manual refers to it as a hole plug. LOL Take a look at the pic below. Is that the part you are referring to?
If it is, remove it and see if the sound stops. Also, inspect it to see if there is evidence of something rubbing it.
Also, is it possible for you to record the sound and then upload it for me to hear? That may help.
Take care,
Joe
See pic below.
Image (Click to make bigger)
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Friday, July 16th, 2021 AT 9:10 PM