E2 Type 12 Upper Bearing
Screeching sounds from the motor may signify a needed replacement of this part.
Factory OEM bearing for the two speed E2 Type 12 (Black, Silver, and e2 Gold) Rainbow vacuum. Bearings get the most wear and is an inexpensive replacement while you are servicing your motor.
If you have any squeals during the start up or slowing down of your unit, then this could be the issue.