Updated: May 12, 2023
Medium-format maker Mamiya Digital Imaging Co., Ltd. was bought out by Phase One.
However, Phase One Japan has stopped providing servicing and repairs to Mamiya cameras in Oct. 2017.
Phase One: https://support.phaseone.com/search/?logicalNames=&q=mamiya
If you’re in Japan and desperate to repair your Mamiya, contact for advice:
Yamada Technical Service
Or join the Mamiya Camera Club in Japan: http://www.mamiya-club.com/
Too bad. Mamiya 67 was a venerated film camera.
Best to just buy a new camera…