Yes, long back. If I am not wrong , 6 months back. Hardly Ajanta ran with CBC(Gowthami's rake) 3 to 4 months. The main reason cited to interchange CBC rake between Gowthami and Ajanta is due to providing full AC 1st class. It seems later Gowthami got full AC 1st coach ( may during 2017 made rake upgrade of Godavari/Telangana). So, Gowthami got its CBC back. One interesting thing in between is Visakha Exp(with previous rakes of 12727/28/23/24) got CBC but not Ajanta.