As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR SHUTTLE 6999 PHX TO CMH RETURNED TO FIELD WHEN THE CREW RECEIVED THE NR 2 T/R UNLOCK MESSAGE. THE CREW DECLARED AN EMERGENCY. MX FOUND THE T/R OUT OF RIG AND RERIGGED. THE FLIGHT WAS SWAPPED WITH ANOTHER A/C. N77260 WAS RETURNED TO SERVICE LATER THE SAME DAY.