Hi Dewatty,
Thanks for the quick response! I have read about Service Bulletin 05-001 where the exhaust return spring and the ecu needed to be replaced. I am the third owner of my ST3 so I don't have any record of whether this service was performed. I was just about to ordering the parts but before I did so, I checked the part number on the ECU and it is the correct part number. It is quite possible that the springs were also replaced. I have a valve clearance check scheduled next month and I will request that the springs are checked to confirm that they are also the correct ones. If not, I will be certain to get them swapped out. I will look for the screw and if I cannot find it I will request that photo from you.