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If the recall applies to that bike, and it hasn't been done yet, he could take the bike to a dealership and get the updated fasteners installed for free. Safety recalls apply to all subsequent owners as well.
I seem to recall (no pun) the '14 and '15 touring bikes had the recall. The new H-D fasteners seem to stick out quite a bit, but they are free if the proposed bike already doesn't have them.
If it has ABS, that is the one thing I'd have the dealer do by flushing the system. The ABS module is very expensive to replace and it needs to be checked out with the proper tool and knowledge. It can be done at home but if you don't have what is needed it is probably cheaper to go to the dealer.
The rest you can visually inspect and decide a course of action.
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