Servicing
 

I have a 99 A6 2.8.
I bought it 5+ years ago with 36,800 miles . It was a previously leased vehicle in excellent condition.For the first 3 years that I owed it, the car was not used much and was garage kept . The last two yearsI have driven it morewith mostly all highway mileage. It now has 56,000 miles. Besides taking it in for all the initial recalls, all I have done is had the oil changed and the battery replaced. It still runs great but I assume some required servicing must be accomplished.
What required maintenanceMUST be done at this time?
Can I have it doneby a local foreign car repair shop and avoid the possible high cost of having it done by an Audi dealership?