2 EEs were carrying a heater, load shifted and strained 1 EEs mid-back. WorkCare called, advised self-care. Incident was reported 1 shift after occurrence. 5.8.2015 Dr released EE w/care not to aggravate back due to findings of Xray & MRI as soft tissue injury. 5.11.2015 F/U appt EE was again release care not to aggravate back. F/U on 5.18.2015 EE was given restriction. F/U 6.1.15.