my museum piece Worcester 280 which has given me flawless heat and water over the last 25yrs developed a leak over year ago(which stopped in the summer months) but now has steadily got worse. I took the cover off and delved inside and took the following picture. As you can see the leak is the diverter valve that appears to have corroded the internal metal plating. Do you think this is a scrapheap job. Thanks..
