As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2766 - CREW REPORTED THAT THE LANDING GEAR FAILED TO RETRACT WITH AN ASSOCIATED LANDING GEAR AIR/GROUND FAIL MESSAGE. THE AIRCRAFT RETURNED TO IAH WHERE MAINTENANCE FOUND THE NOSE LANDING GEAR SLIDING TUBE TO BE LOCKING UP IN THE NOSE GEAR STRUT HOUSING. THE NOSE LANDING GEAR ASSEMBLY WAS REMOVED AND REPLACED, OPERATIONALLY TESTED, AND THE DISCREPANCY CLEARED.