AA2524 MIA-DFW A321, returns to gate due to engine issue. That problem is resolved, everyone boards again, aircraft pushes back, only to return to the gate again with a problem with the other engine.

The captain has indicated the flight crew is doing everything they can to apply some sort of fix, but are having to go through Fort Worth as they are unable to contact maintenance locally in MIA.

Flight ultimately left nearly 13 hours late after pushing the departure to 8am after the flight crew timed out at around 1am.