My local AD (Borsheims) stopped carry GP a number of years ago but they still have access to the same GP Service Center - Tradema in FL and they handled sending it in for me. I had another GP in there for service a few years ago and everything went perfectly fine. I do recall my AD sending to Tradem
Mine is in for service getting a new crystal and rubber strap. Hopefully it will be returning soon - this is the watch I wear most of the summer. Very comfortable and handles everything from mowing the lawn, cycle rides to boating. Probably wear it more than any of my other watches.
Fell in love with the carbon fiber dial. First GP of five I've had the pleasure of owning. Still have this and one other special GP that I wear very often.