KLO 3b5 959 793 Window module

[qlingon]

First I thought it's the regulator, athough there was no visible damage, so I swapped that out, but it didn't help.
The module for the driver's side was acting more and more strangely, finally defaulting to pushing the window up no mater which way I point the button.
I even tried it out with a different motor, no change.

In short, the window module always closes the window. Sounds like a diode bridge failure to me,
but the real problem is that this part cannot be sourced anywhere anymore.
The part no. is KLO 3b5 959 793

Any suggestions, please?