This paper analyzes the semi-Markov model of technical objects age-replacements. The model includes two types of repairs:
perfect repairs and minimal repairs. Minimal repairs in semi-Markov models have been studied in literature only to an extent. In
this paper, the asymptotic availability coefficient and profit per time unit are considered as criteria for the quality of the system
operation. The paper formulates various conditions for the occurrence of the maximum of criteria functions. The two numerical
examples given at the end of the paper illustrate the results obtained in the paper
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