Firstly, welcome aboard. It may seem counter intuitive but there are quite a few S10 owners on UKGSer too, often useful for farkles when needed.
Difficult to to answer your question though - are you equipped to DIY service? The bike looks to be in good order, but there is a big service due shortly. You mention a good SH, but not when last serviced or whether these were all at Yamaha - do you have service receipts to back it up? If so, it's easy to check off the routines against the manual.
What would I do ? Assuming a quality service has been undertaken within the last 6-9 months, I would run a spanner over everything, check the brakes & make sure all the lights etc work correctly. Check the spokes as others have detailed, change the oil/filter, lube the gear shift linkage/pivot & replace the final drive lube.....then get on & ride, ride, ride.
BTW, it would be a good idea to find out exactly who did the ECU re-map in case you need support in the future. There may be a label on the ECU - Often Hilltop, but there are others. Dependent on what/how mods have been made, clearly you don't want say a Yamaha dealer meddling with the ECU, other than to check it for fault/error codes.
Don't forget, if you plan to go touring in Europe, that your exhaust is illegal in some countries - The Swiss are pretty hot on this & can deny entry or confiscate your bike, which can prove a costly mistake.
Have fun & keep us posted.