EMPLOYEE IS STATING THAT HE WAS HELPING CHANGE HYDRAULIC LINE ON THE SHOVEL BOOM. HE IS STATING THAT HE SLIPPED ON BOOM STEPS & CAUGHT HIMSELF BY GRABBING A BANK OF HYDRAULIC HOSES & WRENCHED HIS RT. SHOULDER. EE IS STATING HE WORKED THE REST OF HIS SHIFT & PART OF THE NEXT SHIFT ON 8/3/04, HE THEN FELT HIS SHOULDER ""POP"" ON 8/3/04.