What was found
FLT 0193 - EN ROUTE FROM CMH TO LAS FAULT LIGHT CAME ON FOR COCKPIT DOOR LOCK, AREA OF CENTER LOCK WAS HOT TO THE TOUCH, ALSO OBSERVED AN ELECTRICAL BURNING ODOR, TURNED BACK TO CMH AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE REMOVED AND REPLACED THE COCKPIT DOOR CENTER BOLTING SYSTEM IAW AMM 52-51-12, PG. 1-23; OPERATIONAL CHECK WAS GOOD.