Hi
OK
Unfortunately plaster dust is the worst thing to a vacuum cleaner.
It is very small in size so isn't contained by the paper bag or the filter and it is also abrasive.
The dust will be in the motor itself, thats the way a vacuum cleaner works, it tries to pull the dirt into the motor and its only the bag and filter that stops it.

I am afraid the only answer would be a complete strip down and thorough clean of the machine and to replace the motor.

There are no "copies" of this motor. You would have to get it from miele. The last time I looked the price for a Miele motor was over £100 plus the vat.

I hope this answers your question and you click the accept button for me. By doing so, a proportion of the deposit you have already paid to just Answer, is transferred to me for helping you with your problem today.

Thanks

Rob

Hi
The only test you can do is to meter out the motor, if its open circuit you need to replace it.
Even if it tests ok it may still run noisy
There is no test for the pcb im afraid.
After over 20 years experience, where plaster dust is concerned, its always the motor. There is nothing on a pcb that moves, so in theory, it could work in a bucket of dust, not so the motor

Thanks
Robroyzee40546.4283248843