Thermomix TM6 error c379

Hello

I have a TM6 that started giving error C379, i send it to Vorwerk for repair and they said it was a Power Board failure and needed replacing, but the price was outrageous so i took it back and have been trying to repair it.

I replaced the IGBT's and a supressor capacitor but still no luck.

Does anyone know the error and the cause, someone already been able to fix it.

Regards