As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 0484 - AFTER T/O, LT MLG INDICATED UNSAFE AFTER RETRACTION. RECYCLED THE GEAR AND STILL HAD AN UNSAFE INDICATION. GEAR WAS CLEARLY RETRACTED WITH NO BUFFET, NOISE OR YAW. TURNED BACK AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE REMOVED AND REPLACED THE LT MLG UPLOCK SENSOR IAW BMM 32-61-21-4. OPERATIONAL CHECK WAS GOOD IAW BMM 32-61-00-5.