THE EMPLOYEE IS AN ELECTRICIAN WHO WAS CHANGING PARTS ON A RECTIFIER. HE TWISTED AROUND AND PICKED UP THE PART BEING CHANGED AND FELT PAIN IN HIS LOWER BACK. HE DID NOT REPORT IT UNTIL 12-13-0 0 AND WENT TO THE DOCTOR ON THAT DATE. HE WAS PLACED ON RESTRICTED DUTY UNTIL 12-18-00 FOR A PULLED MUSCLE.