EE working in maintenance over 20 yrs and has been a mechanic for 16 yrs. Duties require to push/pull wrenches, overhead work and various other repetitive motions. 4/26/18 noticed pain in L shoulder but did not report it. EE was using a tracked elevating device to lift and hold dozer belly pan while aligning holes. Diagnosed w/rotator cuff tendinopathy, shoulder surgery 2/28/19.