1 with your timelline as the active window>cmd 0 (sequence settings)
2 Audio Ouput Tab>change grouping to dual mono for the tracks you want to islolate>OK
3 File>Export>Audio to AIFF(s)
4 Choose Rate (48 khz), Depth (24-bit), Config: Channel Grouped, Save
5 QC your tracks (Quality Control, meaning listen to them to hear if that is what you want)
*I'm assuming you only have two tracks. If you have more, then you will have to specify them in the Audio Ouput Tab (outputs) and then assign them in the timeline. (eg ctrl click a3 and assign it to 3&4, ctrl click a4 and assign it to 3&4 etc.