As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT, THE LT MAIN LANDING GEAR UNSAFE LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION. FLIGHT RETURNED TO FIELD AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE M987 PRINTED CIRCUIT CARD. ALSO, ADJUSTED UPLOCK SENSOR ON LT MAIN LANDING GEAR AND REPLACED WORN UPLOCK ROLLER ON STRUT. GEAR RETRACTION AND EXTENSION, POSITION INDICATING AND WARNING SYSTEM NORMAL IAW MM.