EE REPORTED HIS RIGHT KNEE WAS HURTING AND GETTING WORSE. HE THINKS IT HAPPENED A WEEK OR 2 BEFORE (HE DOES NOT KNOW WHEN FOR SURE) WHILE HE WAS CLEANING THE SILICATE TANK. HE SAYS IT MIGHT OF HAPPENED WHEN HE WAS JACK HAMMERING. HE DOES NOT KNOW FOR SURE. HE JUST WANTED TO REPORT IT. Employee went to doc and has restrictions