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It is probably the brush roll motor making the noise. Remove the brush roll & belt and turn both motors on. If you do not hear the noise when both motors are running the noise is likely coming from the brush roll
Most likely, there's something in the dirt tube. Ic could be something like a piece of paper or cellophane, vibrating from the air going over it. without hearing it, a high pitch noise could be different things.
High pitched noise usally happens when the suction pancake fan fins become loose on the shaft.Usallythere is two or more sandwiched on the motorshaft .. Matter of taking the tin split casing apart and check and tighten :^/
You may be loosing your bushings on the motor,if this is an expensive machine it may be cheaper to have it fixed,if not it will burn up eventually.Also try taking the beater bar out and make sure you don't have something rapped around it causing a noise.
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The high pitched noise could be because the vacuum is loosing airflow. does the red light come on on the top? if it does ot emptythe vacuum, replace the cone filter, the secondary filter, and the batting in the top of the machine. also hook the hose to the top of the vacuum to make sure there are no clogs in the hose.
It sounds like you may have a bearing problem. The motor bearing eventually gets damaged by the water vapor that is drawn in by the fan. This will cause a high pitch squeel from the motor. It is possible to replace the bearing, but it should be addressed by a professional techician.