The probe into the adulterated ghee supply to TTD has entered a key phase, with the AP SIT probe expected to wrap up by month-end. The Nellore CBI is preparing to submit a second chargesheet soon. As part of it, CBI DIG Murali Ramba and Visakha Range DIG Gopinath inspected case records in Tirupati, while JD Veeresh Prabhu is scheduled to arrive today.