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Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
From what you have described here this does sound like either a faulty brake switch, multi function switch or a wiring fault to the rear lights.I have seen all of these cause this fault here starting in the order I posted above.
I would have him check for any broken or damaged wiring needing repaired leading to the rear lights.If this is all checked and found o.k. then I would have the brake switch replaced or tested if he has the correct diagrams to do this testing ( unfortunately my info doesnt show the diagrams).
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