As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DECLARED & LANDING UNEVENTFUL. ACFT NOT OVERWEIGHT. DURING CRUISE LT ENG REVERSE UNLOCK LIGHT ILLUMINATED. ACCOMPLISHED QRH PROCEDURE & LIGHT REMAINED ON. LIGHT EXTINGUISHED ABOUT 20 MINUTES LATER WHILE ON DECENT. NO OTHER INDICATIONS. CLEANED LT THRUST REVERSER LATCH SWITCHES. PERFORMED OPERATIONAL CHECK IAW AMM 78-30-00. SYS CHECKED NORMAL.