What was found
FLT 432 - AT COMPLETION OF SCHEDULED FLIGHT, ON THE GROUND, PILOT SHUT DOWN LT ENGINE. THE FIRST OFFICER ATTEMPTED TO PULL THE PROP BLADES THROUGH BY HAND TO FACILITATE COOLING OF THE ENGINE. THE PROP BLADES TURNED APPROXIMATELY 6 INCHES AND THE ENGINE SEIZED. THE PILOT REPORTED ALL ENGINE INDICATIONS TO BE NORMAL THROUGHOUT THE FLIGHT, LANDING, AND PRIOR TO SHUT DOWN. NORMAL COOL-DOWN PROCEDURES WERE FOLLOWED PRIOR TO SHUT DOWN. THE LT ENGINE WAS REMOVED AND REPLACED AND THE AIRCRAFT RETURNED TO SERVICE. (X)