Kitchen Large Electric Appliances - Bosch Nexxt DLX Washer noise/issues

Our Bosch Nexxt DLX washer started to develop a ticking noise when going to the spin mode after I reinstalled the washer.
Basically I had the same issue as many people encounter when having a front loading washer on "wood" floor. Lot's of vibrations throughout the house.
I successfully got rid of the vibrations adding a 1 inch MDF board underneath as well as the special pads that can be found.
However, after putting it back the washer developed a ticking noise when in high spin mode. I can see that the drum has a lot movement/imbalance during the high spin mode. I'm afraid that the drum is touching something inside the machine. Does anyone else have such a ticking noise?
How could I open the machine to check the drum? Is there a service manual available?

BTW. It seems somewhat difficult to balance the machine. Mainly because the machines top isn't entirely flat. Although, I believe I manged to balance it with averaging. But ideas are welcome.

Make sure the unit is completly level. I use a small torpedo level that works well.

You can take the round cover off at the bottom right of the machine in the front and inspect the shocks. The top is easily removed by taking off the screws in the back.

However, my experience has shown that front loading washers do not react well to anything other than a solid concrete floor no matter what kind of bracing is under it.

Any time the machine is moved, the tub locks need to be reinstalled to prevent the tub from moving around when the machine is moved. It can damage the machine if they are not installed.

What are typical defects that can happen moving the machine without the tub locks?

If the tub moves around too much it can damage an electronic control board in the machine. I have only heard of this in Whirlpool machines though. It could potentially damage other parts inside such as the shocks, hoses, etc.