EMPLOYEE WAS CARRYING ABOUT 30 LOBS OF TOOLS UP A FLIGHT OF STAIRS ABOUT 15 FT IN LENGTH TO GET TO THE BLUNGER CATWALK. HE HANDED THE TOOLS DOWN TO A CO-WORKER INSIDE THE BLUNGER. HE THEN CLIM BED DOWN INTO THE BLUNGER AND BEGAN SETTING UP HIS TOOLS. A SHORT TIME LATER HE FELT PAIN IN HIS CHEST AND LEFT SHOULDER.