THREE persons booked in a case of alleged corruption during the construction of a central library in the Mumbai University’s Kalina campus, in which NCP leader Chhagan Bhujbal is a co-accused, have sought discharge from the case. The three are Gajanan Sawant, who was a sub-divisional engineer with the public works department then headed by Bhujbal; Harish Patil, an executive engineer; and Anil Kumar Gaikwad, the then superintending engineer.