As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LEFT MLG DID NOT INDICATE DOWN & LOCKED WHEN GEAR WAS EXTENDED ON APPROACH TO IAH. MANUAL EXTENSION WAS PERFORMED AND YAW WAS FELT WHEN LEFT MAIN EXTENDED. THE GEAR INDICATED 3 GREEN AND LANDING WAS NORMAL. THE GEAR WAS SWUNG SEVERAL TIMES WITH NO FAULTS NOTED. THE LEFT MAIN GEAR UPLOCK ACTUATOR WAS REMOVED AND REPLACED AS A PRECAUTIONARY MEASURE IAW M/M 32-32-41. OPERATIONAL CHECKS WERE GOOD.