There are alot of these out here. Such good work horses. They go and go until there is a major clog, most people don’t even notice that it has been struggling for years. Finally showed a solid sign when the pressure stat clogged and the points stayed on and the boiler overheated and the relief valve triggered. There was a very thick and hard layer of scale in the bottom of the boiler and 1/3 of the element was toast. Ceramic form the element was also freely accumulating in the boiler from the element. Taps were leaking and there was a large area of rust on the top frame where the moisture accumulates from the hot water tap. This was going to take at least 5 hours spanned out on 5 days. Descaled with product over 8 times, redid the clips on the element and the probe, changed many gaskets.
Quoted 5 hours, billed 5 hours. New element, lots of gaskets. Machine is almost rebuilt.