Insert brew group again

First a hello to the round!!
My name is Walter, I am 67 years ....
Now my problem:
14 days ago, the machine stopped doing its job after the milk preparation during the order cappuccino
.
Nothing went!! After much reading in forums, I decided to purchase and install a new power board.
So far, so good after installation, the machine started again, with the error message Insert brew group. In this situation, the brew group is in the removal position but to remove it, I have to manually move the levers to the necessary position.
Thereupon again read quite a few posts regarding this.
So far, I have done the following work: removed the brewing
piston and also the brew group taken apart cleaned completely with new seals provided put
back together.
At the brewing piston I have also renewed the limit switch with (yes he is right around).
Drive removed cleaned with new spindle nut, new belt, new limit switch and new Hall sensor provided, of course the spindle greased.
Today first attempt full of hope, what a disillusionment " insert brew group"!!!
With the appropriate the key combination ei reset performed, again insert BG
.

Made a test run, the brew group moves to the upper and lower point, ie to the limit switches.

Does anyone here have any advice ???

My thoughts go to a new drive unit ???

Slowly it goes into the money,
Have at the same time, if the part is already so far on, the 3 solenoid valves exchanged the milk outlet renewed, all seals and the sieve of the brew group and the seals of the brewing piston renewed, new power board, new microswitches, new Hall sensor, new belt and spindle nut and and and
....

I do not want to give up!!

Does anyone here have any advice/tip?

??


many greetings Walter