Ohilins USA is in North Carolina. Why go to the Chevy garage to have your Ford serviced?
Ohlins makes it very easy. Give them a call then fill out a form with some info and send the shock and the form to them. This is also a great opportunity to have the shock re-sprung (if needed) for you weight and built/valved for how you ride.
Actually there are factory trained independent techs. My local guy went to Ohlins training and is one of them. He rebuilt the Sachs shock on my V11 Sport, in the process I found we also have a local company that actually builds shocks.
So far as the facility in NC, I believe it's now owned by Andreani and they service and distribute many brands including Ohlins.
My point, you might have a local guy that can do the job but if you don't, regardless of brand of suspension, you might give Andreani a call.