What was found
FLT 4385 - DURING CRUISE FROM ATL-CRW, AT APPROXIMATELY 27,000 FEET THE CREW RECEIVED A LEFT THRUST REVERSER UNLOCK LIGHT. THE CREW PERFORMED AN EMERGENCY STOW WITH NO CHANGE. AN EMERGENCY WAS DECLARED, EMERGENCY PROCEDURES WERE FOLLOWED AND THE AIRCRAFT DIVERTED TO TYS, LANDING SAFELY. MAINTENANCE REMOVED AND REPLACED THE POWER DRIVE UNIT. OPERATIONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)