Thanks, I actually found the same thing on a consumer-facing (non-TA) page:
http://help.jetblue.com/SRVS/CGI-BIN...ase=obj(383871)
Honoring the Lower Fare
If you are rebooking within 14 days of original purchase and prior to departure, there is no fee to honor the lower fare found on a JetBlue-operated flight.
In the event that a fare on a JetBlue-operated flight decreases after purchase, customers may rebook travel at the lower fare on the same flight to receive a credit for the difference in fare.
The following fees apply to honor the lower fare for the same fare option on tickets exchanged 15 or more days from original purchase date, depending on which fare you purchased:
Blue - $70
Blue Plus - $60
Blue Flex - No fee
Any difference in fare will be returned in the form of a JetBlue credit, good for one year from the date of issuance.
For questions on JetBlue's honoring a lower fare guidelines, you're welcome to contact our reservations team at 1-800-JETBLUE (538-2583).
Guess I should have looked harder in the first place. Hopefully this will help someone else. :P