My new PE-14 Making a whining noise when slowing down?

mspec

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Quick question. Just the the PE a few days ago, used it on a trunk so far but I noticed when I let off the trigger and the machine is rotating to a stop, it makes a whining sound as it is slowing down.

Is this Normal? I am going to catch a video of this tomorrow when im back at the shop.
 
mine does this aswell. i blew mine out with a compressor and it stopped. mine has about 300 hours on it though. also it didnt start until i had about 100hours on it
 
anyone else experience this too?? i just received my polisher from autogeek and notice this weird noise when letting off the trigger, is this normal....?
 
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