Can you post the E-Nr number of the appliance please?
If not on a label, it will be very faintly etched across the top of the inner door.
You need to empty the machine of water.
Take out the filters and remove the water in the sump bowl.
Then, you lever the cover off to access the pump impellor.
Click here for the user manual
It shows what and how to lever the part out.
Check it out, see what you find and get back to me.
Hope this helps
Big job I'm afraid.
You need to fully empty the appliance then either strip the tub off to get to the pump or lie it on it's back and take the base off.
Either way, it's a big strip down.
Try taking the panel across the front off.
Take the screws holding the tub to the base out.
Lift the tub up a little and put a block to prevent it falling on you.
You may find you just have enough room to get to the pump.
Sorry, tilting it off the base a little is the only possible short cut.
Good luck with the repair.