Have you checked the "Getting Started Guide" for the Jaguars? On page 2 there is an LED Status table. According to the one we're looking at right now under fault conditions
Slow flashing yellow indicate Loss of servo link
Slow flashing red indicate general fault condition
Flashing red and yellow indicates calibration mode failure
Look at the following link for the full guide:
http://www.luminarymicro.com/jaguar
Best of luck in getting them fixed!
Team 2582