I assembled used M7II, 43mm, 80mm lenses and pano kit from ebay last year. In any case, I figure if needed to, I can send it to numbers of reputable repair shops for CLA. Mamiya USA won't cover but the warranty is for only one year. After a year, they will repair anything for a high fee. As I understood, grey market products are still cover, you have to ship it back to where your original purchases were.
-cheers, mervyn