EMPLOYEE WAS UNDER NO.4 COOLER SLIDE. HE WAS DOWN UNDER SLIDE TO WORK ON TIGHTENING BOLTS ON THE CLEAN OUT SCREW. WHILE IN THE PROCESS OF DOING SO EMPLOYEE FELT LOWER BACK PAIN IN RIGHT HIP AN D LEG. THIS WAS NOT REPORTED UNTIL 9-6-00, SO ISBEING REPORTED MORE THAN 10 AYS AFTER OCCURRENCE.