The Dorchester leg of the Red Line will be shut down again this weekend as workers continue construction at Ashmont Station. The two-day hiatus will be repeated for a final weekend on April 4 and 5. Buses along Dorchester Avenue will replace train service between JFK-UMass and Ashmont on Saturday and Sunday. The T says that the shut-downs will also allow contractors “install additional improvements at Savin Hill station.” Customers can call the MBTA Construction Hotline at 617-222-6757 with additional questions.