Servicing my car (on a PCP agreement)

[EddieMurphy]

I have my Fiat 500 Abarth on a PCP agreement. It's due for a service - do I need to have it serviced at a Fiat Abarth dealership or can I have it serviced at an independent garage without fear of future penalty? The cost difference between servicing at these 2 types of garage is hefty. I have also just informed Fiat that I want to voluntarily terminate the agreement under the 50% rule. I need to get the car serviced before it goes back.