Rear wiper and nearside brake light not working. Garage unable to find a fault and suspects a control module. Devices working OK with new feeds but ECU not recognising brake light. Shows light fault when brake pedal first pressed after starting.
If there are any circuit breaks they appear to be further forward.
The car is only under warranty for another month so there isn't much time for it to develop a definite ECU fault.
It's otherwise running OK so I'm reluctant to experiment later with any second hand ECU . I would also have to trace and undo the garage's new wiring.