What was found
MCN/ATL - FLT 7219 - DURING FLIGHT, LEFT ENGINE DUCT LEAK LIGHT ILLUMINATED. THE LEFT ENGINE WAS SHUT DOWN AND SECURED PER POH PROCEDURES, AND THE CREW MADE A SUCCESSFUL SINGLE ENGINE LANDING SAFELY IN ATL. REMOVED AND REPLACED THE LEFT DE-ICE PRESSURE REGULATOR. S/N OFF PE2120, S/N ON RF1842. OPERATIONAL AND LEAK CHECK GOOD IAW/MM. (X)