As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR UNSAFE LIGHT ILLUMINATED AFTER TAKEOFF. NOSE GEAR WOULD NOT LOCK IN THE UP POSITION. AIR RETURN WITH GEAR DOWN. TROUBLESHOOTING FOUND NOSE GEAR EMERGENCY RELEASE CABLE TOO TIGHT AND NOT ALLOWING UPLOCK TO FULLY ENGAGE ROLLER TO MAKE SWITCH. ADJUSTED EMERGENCY RELEASE CABLE AS NEEDED AND CYCLED GEAR SEVERAL TIMES AND ALL CHECKS GOOD.