Floody

Hi I am new to the forum and could do with some help Please !!!!! A Friend recommended a mechanic to me for a service on my bike, it has had an intermittent starting problem which has been getting worse, due to me falling off a roof recently a friend rode the bike for me stalling it a few times pulling away not being used to it and it fired first time when we got to the mechanic it would not start he removed the data tool alarm and eventually tracked it down to dirty contacts on a multi plug. he has now told me that the brake lights are not working through either switch and it could be the ecu. I would appreciate any help on this if any one has prior knowledge. As I said new to forum so I hope I have carried this out, without breaking any rules Thanks Sean