I bought a 144 GMT new from Ralf Haffner in 2001. I wore it constantly for several years until it started losing around 60 sec per day. The chrono also is not working. Should I pay to have it serviced and then sell it, or should I sell it as is and let it ride? The case and bracelet are in fantastic shape...I think it just needs routine servicing. New ones are going for over $2k...anyone else have a predicament like this before?