As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - AIRCRAFT WAS DIVERTED FROM CLT TO TYS WHEN ON CLIMBOUT, A WARNING INDICATION OF THE NOSE LANDING GEAR DOOR WOULDN'T RETRACT. MAINTENANCE ADJUSTED THE DOOR SWITCHES AND CYCLED GEAR. OPS CHECKS WERE GOOD AND RELEASED BACK TO SERVICE.