EMPLOYEE ALLEGED THAT ON 2-15-00 HE FELT PAIN IN HIS LOWER BACK WHILE EXITING THE DECK ON FLETCHER ROOF BOLTER. INCIDENT WAS NOT REPORTED TO HIS SUPERVISOR UNTIL 2-16. AT THAT TIME EMPLOYEE DID NOT REQUEST FIRST AID AND WAS NOT IN PHYSICAL PAIN. EMPLOYEE SAW PHYSICIAN ON 2-21-00.