EE1 and EE2 were moving HVAC window units in the Electrical store room to perform maintenance. EE1 was holding one of the units and the unit became wedged against a reel of cable. EE1 lifted that reel up over the AC unit with left arm out of their way. While doing, so ee1 felt a sharp pain in shoulder. EE1 did not see a doctor until 7/21/2016