Thanks for your question!
Based on that serial number it looks like your piano was built in 1978. Kimball pianos unfortunately were not built too well in the later part of the 20th century and their pricing was on the lower end. They are no longer in business today. You mention the piano "needs work" so I am assuming the condition is "fair". If there are significant issues that render the piano unplayable or unable to hold pitch after tuning then this price would need to be adjusted to take that into account. Based on your description as well as the used piano market and depreciation from age, I would recommend a selling price today of approximately $2,000-$2,600. Best wishes!
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Hi, do you need more help with this?