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Lee,
Nice 50W/ch amp - I had a similar integrated amp I bought in 1981 and it worked well over the years. Is the same channel missing if you use the FM as well as CD/tape/phono? The problem could be in the preamp or power amp stage - some receivers have known weak areas, especially after 20 years - check on line to see if you find anything.
Its best to get a service manual to troubleshoot these. Some manuals are available on-line as pdfs thru various sites and contain component layouts, circuit diagrams, tips, parts lists, etc.
Some receivers have their components and circuit boards laid out in a mirror-fashion which makes it easier to troubleshoot (checking similar points side to side for signal and or voltage until you find the difference). This receiver still has a lot of discrete parts vs. the present day "all in one chip" designs. Previous owner probably received a "courtesy estimate" from a shop that scared him/her off and made it more economical just to buy another receiver. With the right skills and patience, these are fixable! Good luck!
Andy
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