Cost of 120K service on 2011 TDI 2.0

This is tough.

I really like my Golf, but the estimate I just got for my 120K service is $3600. Carfax value of the car is $3400 (trade-in) and Edmunds has it at $3000. I didn't get a breakdown of the service estimate, just a number, but the estimate is just for the air filter, DPF, fuel filter, and DSG fluid and filter. They said the DPF is the biggest cost. Recommendations? TIA

The estimate is from a local shop that started as a big diesel truck repair place, but they have expanded to work on all vehicles. They are well recommended.