Airtran Reward Changes/Cancellations

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I had 8.5 credits with one about to expire last night and booked a oneway to Cancun on a saturday before the expiration.

Can I change the date of my flight forward or back for free as long as it is not an hour before departure. It appeared that I could do this free of charge, but now I am afraid it will redeposit my credits if and when I make a change and end up costing me any credits that have expired between now and the day I make a change.

Can someone please clarify this policy?

Thanks,
Stallion
I'm sure someone will have a better answer, but this may be a case where it's worth paying the phone fee (if any) to have an agent make the changes.
Thanks for the tip that makes sense.

If anyone can confirm whether my theory should work please let me know.
Call an A+CSR. Historically, reward travelers have been allowed a single itinerary change without charge, The 1 hour before flight time part might be dicey....it is possible that a gate agent could do this for you..I'm not sure