Hi, just in case anyone was following this. Almost certainly the cause was due to drainage after they changed my main harness first time round following an issue with the display turning off when turning left. they changed a number of parts - I don't recall all of them - but it had nothing to do with the tuneboyed ECU thats for sure. Did a 3000km trip and no problems at all (staying at a lovely 13.1V). Just one other thing - when they changed the parts they also replaced my shourai lithium battery with another recommend lithium brand (sorry can't remember which one) because apparently the shourai battery has caused unspecified problems for them in the past on other customers bikes. hopefully The End !