Speaking from personal experience:
I bought my XF + IQ3 100MP from a different continent, and when it broke down, I spoke to the local Phase One office representative. So in order to generate what they call an "RMA number" I had to go through the local dealer. Only a dealer can generate an RMA and Phase One Denmark won't open a repair case without an RMA.
So in the end, because my set was considered a parallel import and I had to pay the local dealer a handling charge of around US$ 750,- which included shipping and import / export handling, which in the end I thought was reasonable since I didn't have to go through all the trouble myself.
As for the actual repair, that part was considered under warranty, so they didn't charge me anything for the parts nor the labor, no questions asked. I didn't have to present an invoice or any proof of purchase for that matter, I guess they can track all information based on the serial number.
The only downside with warranty is that, even though it says so in the manual, a temporary loaner camera will only be provided at the local dealer's discretion, so there's no guarantee that during the time your camera is gone, you'll have a replacement form Phase One. I can only say, lucky I'm not a professional who's earning a living with photography, otherwise I would have been severely f**ked up...:cussing: