WHILE CLEARING SNOW FROM A STAIRWAY, WORKER SLIPPED ON ICE/SNOW AND HIT HIS SHOULDER ON HAND RAIL. THIS INJURY DID NOT BECOME REPORTABLE UNTIL 1/28/09 WHEN, AS HIS PAIN WORSENED, WORKER WENT TO DOCTOR AND WAS DIAGNOSED WITH A TORN ROTATOR CUFF. WORKER WAS ON SEASONAL LAYOFF AS OF 12/24/08.