If you have a DR-55 in need of repair please feel free to contact me. I can provide a "by mail" repair service and stock many spares and replacement parts for the DR-55 and similar Memory Rhythm type drum machines such as the Soundmaster SR-88, DRM-1 and others. Repairs for these machines are usually inexpensive - I've rescued dozens of them.
If you require any advice or a repair quote, I'm happy to help - use the "ask a question" link on this page or you can get in touch via the System J Synthesizers Facebook page.