I think you will be struggling without the proper info/diagnostic equipment on this.
The system has three ECUs connected by Fibre Optics for communication and there are software updates for these in relation to Control Unit faults.
Depending on which ECU the fault relates to there MAY be a software update and without access to this you will be stuck.
I have had to replace ECUs on these before for ECU related faults but even if you go down that route the new unit will need coded to the car.
Regards
Sean
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