EMPLOYEE STATED THAT HE BELIEVES WHILE PREPARINGTHE IMPACT CRUSHER FOR SERVICE HE REINJURED HIS LOWER BACK. EMPLOYEE STATED THAT HE FELT NO PAIN OR DISCOMFORT UNTIL THAT EVENING WHEN GETTING R EADY TO LAY DOWN FOR THE NIGHT. EMPLOYEE ALSO STATED THAT HE BELIEVES IT IS FROM AN UNREPORTED INJURY SEVERAL YEARS AGO. SUSTAINED WHILE MOVING BAGS.