Sorry for my english. I am from Brazil.
Have you finished your job? I had some experience with this kind of migration. I developed a tool (similar CCCA for IBM) that can help you to make the inventory and this tools can make the most of changes needs in your source code.
This tools make a sheet (excel) where you can see all changes that you need to do in your programs.
This tools can scan your source code since DOS/VS-LANGVL(1)(Cobol 68 Standard) until COBOL for MVS & VM NOCMPR2(Cobol 85 Standard).
Some conditions doesn’t check during compile process you can have problems during run the programs, example: Using ILBOABN0 to force an abend. You need to change call to CEE3ABD.