Welcome woodsie,
Have you had any issues with the car starting when warm? There was a warm start issue with some SR's. There is quite a lot about it on here. Initially they thought it was software related but updated software did little to solve the problem. I was always skeptical about it being software as only a percentage of vehicles were affected.
Anyway, most of the ones that had the problem have now been fixed under warranty with new injectors. It appears there must have been a faulty batch. A couple of members actually reported rough idle etc.. after having new injectors fitted.
So on that note, I suspect an issue with the injectors. Keep at them. It's not good enough.
Many of us here feel the same about this new "fault not found/ no codes" mentality.