ETAM 29.660 Authentic cappuccino

Hi all
,have purchased a used machine that was sold as untested. In the photo, the machine was still normal on u.showed only "Fill water tank". When the machine arrived at me, it shows only briefly "self-diagnosis" in the display u.then the display was dark again. Nothing else happened. Then I opened the flap on the side and could see that the brew group is on top and does not move. Guess the seller just pulled the plug when the machine was on.
Wanted to then go into test mode to test if the brew group would go down in the test. But then had to find out that the usual test mode button combination for the ETAM 36.xxx doesn't work here because the machine doesn't have a latte macchiato button.
Can anyone tell me which button combination would be correct for the ETAM 29.660?
Or is there a way to operate the brew group drive manually?
Or do I now have to disassemble the whole machine to get the complete drive including brew group out?

I hope someone has a tip on the best way to proceed here?
Also, does anyone have any tips on where I can find a repair manual for this machine?

Thanks in advance.