Can anyone help please? In the past 4 weeks four of our pressed steel radiators have sprung leaks. The central heating system was installed when the house was new in 1992. It is an open system. In two of the rads the leaks have appeared on seams, but in the other two pinholes were in the main body nowhere near a seam. All leaking rads are on the ground floor. The boiler is original, but we are on our second central heating pump. We are in a hard water area but have a water softener. Any suggestions would be gratefully received.