SQL code for changing a column to an identity column that is a primary key. You have to drop the key, drop the column, add the column back in and then set the primary key
ALTER TABLE CEFP.CEFPInspectionLeakage DROP CONSTRAINT pkCEFPInspectionLeakageID
ALTER TABLE CEFP.CEFPInspectionLeakage DROP COLUMN InspectionLeakageID
ALTER TABLE CEFP.CEFPInspectionLeakage add InspectionLeakageID int identity(1,1)
ALTER TABLE CEFP.CEFPInspectionLeakage ADD CONSTRAINT pkCEFPInspectionLeakageID PRIMARY KEY(InspectionLeakageID)