I keep reading about W/S ECU's tested???? I may be wrong but since when did MSD start servicing and testing ECU's - i was under the impression that James tests the ECU on a like for like car not the actual ECU as i had mine checked in the early days, i had the driver fitted in 2009 and had to wait for a L8 W/S car just to plug in and see if it would operate but mine turned out to be the baby board ribbon had failed.
So if James has said it operated fine then you need to start looking elsewhere on the car