If it's an 08 with the Yam crash bars and ally bash plate then check the front crash bar mounting near the frame oil bung for cracks, and the rear bash plate mountings for cracks. There's nothing you can do it about it warranty wise now, but better to know. The crash bars are quite easy to weld back up.

To get access to the reg/rect plug you may well need to remove the horn, and the reg/rect. If someone came to look at my bike and wanted to start taking it apart I would tell them to trot on. It's not a big thing to do once you've bought the bike.
Incidentally not all Ten's have had issues with the plug, in fact it's been quite few, across both 08 and 09.

As mentioned cush drive rubbers are dire and will fall apart. Check OE chain as it's not the best (pull back off rear sprocket, and try and twist lower run). If the bike has around 10k on the clock then check the rear shock for excessive sag.