As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN-ROUTE RECEIVED LT REVERSER UNLOCKED CAUTION. COMPLIED WITH QRH & DIVERTED. REVERSER APPEARS STOWED ON WALK AROUND. DEACTIVATED LT THRUST REVERSER IAW SUPP 15-046. COMPLIED WITH M ACTION. TROUBLE SHOT & FOUND LT THRUST REVERSER STOW SWITCH TO BE EXTREMELY FAR OUT OF RIG. RIGGED STOW SWITCH IAW AMM 78-30. OPERATIONS CHECKED GOOD. REACTIVATED LT THRUST REVERSER, REMOVED PLACARD & FROM MEL.