7.18.8.1 Define Modification 5.14.4.1 Define and Maintain Repair Structure and Routing 5.14.3.1 Define and Maintain Maintenance Level Structure and Routing 5.14.2.1 Define MRO Manufacturing Operational Data 5.14.6.1 Associate Repair Codes, Discrepancy Codes and Modification Headers VIM Serial Part Revision Modification Definition 5.14.1.1 Setting Up Part Service and Pricing Modification Requirements