As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED NO DOWN LOCK INDICATION FOR THE LEFT MAIN GEAR WHILE ON APPROACH, DECLARED EMERGENCY AND LANDED DTW WITHOUT INCIDENT. WILL UPDATE THIS REPORT AFTER MAINTENANCE. MAINTENANCE REMOVED AND REPLACED LT MLG DOWN LOCK SWITCH. OPERATIONAL CHECK GOOD.