WHILE REMOVING SEAT FROM A 637G, EMPLOYEE HEARD A POP IN SHOULDER. TOOK EE TO EMERGENCY ROOM, NO MEDS WERE PRESCRIBED, REFERRED TO AN ORTHEPEDIC SPECIALIST. DIAGNOSIS FROM DR. ON 7-3-06 WAS. ARTHRITIS MASS ON SHOULDER THAT OVER TIME HAD CUT THROUGH THE BICEP TENDON. THE INCIDENT COULD HAVE HAPPENED ANYWHERE AT ANYTIME. RAWHIDE IS REPORTING THIS AS A REPORTABLE ILLNESS.