I bought my Citizen Chronomaster through Katsu Higuchi in Japan in 2007. Subsequently I posted much data here at Watchseek showing how the watch rapidly sped up over time and way out of spec, repeating that bad behavior after going back to Japan for service. Finally Higuchi decided it needed a new movement and in fact after that it performed MUCH better. I'm enclosing a graph showing that in the ~5 years it ran on its latest battery the watch stayed within a 4 1/2 second band compared to UTC, although that would not have been true for much longer.
But now the battery is dead and the watch is out of warranty. Higuchi did not reply to my last request for information about how to get the battery replaced and the watch regulated.
I have two questions for you better-informed people.
1) How can I get the job done by Citizen, presumably in Japan?
2) I can replace the battery myself, and grease the o-ring. I can certainly NOT regulate the rate, and beyond that I'm worried that the rate and TC parameters might be stored in volatile memory and would be lost if the battery is changed. Does anyone have experience changing the A660 battery at home?
Any help will be greatly appreciated!