ON 5-30-01 EMPLOYEE WAS ATTEMPTING TO OPEN A VALVE THAT HAD NOT BEEN OPENED FOR SEVERAL YEARS. THE VALVE WAS STUCK AND EMPLOYEE EXERTED EXCESSIVE PRESSURE TO OPEN VALVE. DUE TO PERSISTENT PAIN , EMPLOYEE WAS TAKEN FOR MEDICAL SERVICES 6-20-01, AND DIAGNOSED WITH A MINOR MUSCLE STRAIN TO HIS LOWER ARM.