AA's RTW desk is +1 800 247 3247. It's telephone only but they can normally set everything up so the reissue can be done at the AA desk at a specified airport.

The only time I've found this gets difficult is if you are taking flights on the ticket during the period when they are trying to set it up for reissue (i.e. if you are trying to get the reissue done in the middle of a sequence of more or less back-to-back flights).