EE WAS CLEANING SCREEN ON SPLITTER BOX. AS EE WAS REMOVING SCREEN FROM HOLDER THE SCREEN SLIPPED & EE GRABBED FOR IT, FEELING PAIN IN HIS LEFT SHOULDER. EE WAS TAKEN TO THE DR. AND WAS DIAGNO SED WITH A STRAIN BUT DID NOT PLACE HIM ON LIGHT DUTY AT THAT TIME. EE WORKED THRU CHRISTMAS BUT CONTINUED TO HAVE PROBLEMS. MRI WAS PERFORMED WHICH DETERMINED A DISC PROBLEM. PLACED ON L.DUTY