Originally Posted by beerup

In Tripcase you should be able to import the reservation via the PNR by creating a new trip and using the "link a booking" function. Then from the documents section you should be able to find the ticket number from the eTicket.

It's a real pain that the AA refunds site removed the ability to lookup an existing reservation by the locator. IFAIK you need the ticket number to access the refunds or the receipt section. That's definitely a functionality downgrade given that the locator is generally more accessible (and sometimes you are going there to retrieve the ticket number as in the OP's scenario).