This paper presents a repair planning model for the maintenance department that repairs and inspects canned beverage vending machines to efficiently plan and operate its workforce in order to minimize labor costs. By applying data obtained from actual maintenance department operations, we analyze the practicality of the proposed repair planning model. In particular, the primary focus of analysis in this paper is how labor costs and operational strategies change according to variations in the repair planning model's various parameters. First, as the failure rate of the medium-repair category increased relative to the light-repair category, labor costs and the optimal inspection rate showed a much more sensitive increase. Second, the work efficiency of intern employees exhibited an inverse relationship with labor costs and the optimal inspection rate. Third, it was found that labor costs increased steeply as the inspection rate in the medium-repair category exceeded its optimal value, compared to the light-repair category. Finally, for the light-repair category, it was found that increasing the inspection rate proactively to prevent failures was a good operational strategy as the ratio of repair time to inspection time increased, while the medium-repair category was found to be largely unaffected by this ratio.