I am currently mid a DONE4 now on a AA paper ticket. It's a long story and a thick handwritten ticket.

I am ticketed on a one stop flight AA879 EWR-DFW-PSP. According to the Itinerary Notification I received today from AA it is now two flights, AA677 EWR-DFW and AA879 DFW-PSP with a marginal time change.
While I imagine I'll be protected and potentially have a 21 segment ONEx, should I contact AA to reissue or should I just front at the desk in EWR and they will give me two boarding passes for one voucher? Please, please I hope it is the second!