As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT AT ALTITUDE THE RT THRUST REVERSER UNLOCK LAMP CAME ON WITH THE MASTER WARNING, THE PILOTS FOLLOWED THEIR CHECKLIST & WENT TO EMER STOW, THE UNLOCK LIGHT STAYED ON, THE PILOTS DIVERTED & LANDED WITHOUT INCIDENT. TROUBLESHOOTING WAS PERFORMED & FOUND TO BE THE THE RT THRUST REVERSER STOW SWITCH PN 53ND78304-1, THE SWITCH WAS REPLACED.