Buildplatform stuck, steppermotor screaming

The buildplatform on my printer has stoped half way up.
The stepper motor screams when the printer tries to reset position during startup. I tried to turn the lead screw by hand (just to check if there were any debris in the threads) it was a bit heawy but it rotated.
Anyone with same experiece ?
Can i do something or is it just to submit a request ?

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