In this note the general treatment of a complex system having two types of components of classR1 havingm compoments and classR2 havingn components, with exponential failure time distributions and general waiting & repair time distributions have been examinated. The Laplace transforms of the probabilities that the system is operating under normal efficiency, reduced efficiency, waiting to repair or is under repair state have been obtained. In particular case, these probabilities have been inverted for K-Erlangian distributions.