EE CARRYING A BOX OF FITTINGS DOWN 4 WOOD STEPS ON OR ABOUT 2/15/02, SLIPPED ON ICY STEP. SUPERVISOR ASKED EE IF HE WAS OK, EE SAID HE WAS OK, THAT HE BUMPED & SCRAPED HIS ELBOW. NO COMPLAINT OF INJURY TO HIS BACK TILL 3/5/02 AT WHICH TIME WE TOOK HIM IN FOR MED EXAM & HE WAS PUT ON LIGHT DUTY. NEVER COMPLAINED TILL 3/5/02 OF ANY BACK PROBLEMS.