Two people moving a gear box upstairs on a two wheel dolly. While moving it they had to turn a corner at the top of the stairs. EE felt soreness in the left hip & buttock area but it didn't hurt bad so continued to work. Then on 10/13 while working on brake lines under a pickup truck, EE was twisting and re-aggravated it. Rested for three days but saw a Dr and was put on RD.