Hello, no, we can't explain repair procedures in this forum. However, we can suggest consulting a local repair shop near you for some guidance.
Use this link to find some shops near you that can help with your concern:
www.repairpal.com/repair-shops
RepairPal Certified shops can diagnose and repair your 2007 Audi Q7. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.