As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED THAT THE LT TR ANNUNCIATOR DID NOT ILLUMINATE WHEN THE LT TR WAS DEPLOYED ON LANDING. ANNUNCIATOR TEST CONFIRMED THE BULB WAS WORKING. TROUBLESHOOTING IDENTIFIED THE TR DEPLOY SWITCH TO BE DEFECTIVE. THE SWITCH WAS REPLACED WITH A NEW SWITCH & THE ACFT WAS RETURNED TO SERVICE.