The current study deals with machine repair problem with service interruptions and working vacation. The server being working vacation of random length when there are no machines to be repaired. The service process is not completely stopped during the vacation period. Instead, different repair rates are used during normal busy period and vacation state. The repair time, vacation time, failure times are assumed to be exponentially distributed. Various performance measures are calculated using Runge-Kutta method with MATLAB software.

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