HE WAS SITTING ON THE LOADER THAT HE WORKS ON. AS HE WAS SITTING HE SAID HE FELT A TWINGE IN HIS BACK. HE TOLD COWORKER THAT HE NEEDED TO THE DR. SENT TO MEDICAL CENTER. TOLD THE RETURN TO REG ULAR DUTY. HAS FOLLOWUP APPTS. FOR THERAPY. THIS WAS A REOCCURANCE OF AN INITIAL INJURY.