What was found
FLT 741 - BWI-CLT - DURING CLIMB, LT CSD LOW OIL PRESSURE LIGHT ILLUMINATED. CAPTAIN BELIEVED CSD DID NOT DISCONNECT. RETURNED TO FIELD. MAINTENANCE FOUND THAT THE CSD FAILED, AND DID IN FACT DISCONNECT. A/C WAS RELEASED PER MEL 24-1A. THE CSD WAS LATER REPLACED. (M)