Look in the Master Script. There you should find a CALL statement that will lead to a macro (several actually). There you will be able to make your changes.
Don't forget to save your changes out as a new part or else when the library is updated, you will lose all your modifications.
HTH
Erich
AC 19 6006 & AC 20
Mac OS 10.11.5
15" Retina MacBook Pro 2.6
27" iMac Retina 5K