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Message: <blockquote data-quote="Tigerhaze" data-source="post: 75443" data-attributes="member: 6436"><p>You have to be a little careful about service manuals for the 610- I know that there was a serial number split for "early" and "late" Model 610s because my Model 500 manual also covered the early 610s. There were apparently also running updates (replacement pages) for some of the manual sections so I would be careful with that as well if using an original manual.</p></blockquote><p></p>