EE was in process of tightening the coupling bolts for the hub when EE felt sharp pain in upper left shoulder. The EE was treated by in-house ARNP. Went to dr on 5/11/2021 was given a cortisone shot and ordered PT. No work restrictions. Update: EE had surgery on 1/19/22 & returned to restricted duty 3/15/22 & full duty as of 7/29/22.