AEG washmachine AC motor controller

[RetiredElectronicus]

Hello,
Recently the ball bearings of our washmachine AEG 74650 drum are broken and to repair this, it is too expensive for this old machine.
By dismanteling the machine, I found a nice AC motor with tacho and frequency controller that I like to use as a stand alone speed control unit..
It looks that the speed control of the motor driver is controlled by a serial link but I miss the information of the serial data protocol and also the hardware configuration of the serial link.
The motor controller label is "ELUX ASSEMBLY CODE 132527705/SUPPLIER NAME POWER-ONE/ SUPPLIER TYPE 4334991L" (Made in China).
The main control board is "Electrolux 132541724" or pcb "EWM2500".
I found some general info on service manuals of the washmachine but no electronic diagrams or info about serial communication between the boards.
If by chance somebody could share this info, I would be happy.
I found a electronic diagram of a previous control board but unfortunately this board had not the serial link yet for an AC motor controller. (The former machines had a DC motor controlled by a triac assembled on the main board).
Thanks in advance for any help.