EE WAS LANDING AN IDLER ROLLER ACROSS A TRUSS TO A SECOND EE FOR INSTALLATION AND FELT A SHARP PAIN IN HIS BACK. HE CLAIMS THAT HE HAD HAD REOCURRING PAIN SINCE THAT TIME AND DECIDED TO HAVE IT CHECKED OUT ON 9-12-03 AND THE SAFETY DEPT. BECAME AWARE OF THE DIAGNOSES ON 9-14-03