Im so sorry that no oneelse has responded to you.
Apologies for my delayin replying, I only just came online and saw your question. Are youstill looking for help with this?
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On the back wall, inside you should see a fan.
I suspect that the fan blade is slghtly ben and hitting the housing.
You should check this out and if the fan is badly bent you will need to replace it
If you need more help, please let me have the model number
In the meantime,
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This willnot close your question and you can still come back to me if you needmore help