I don't see any alarm bells saying the boiler has to be replaced - yet.
There's a number of fairly minor things which can cause that valve to leak. Then the boiler might well need some claning internally. You don't say what/how old the boiler is, but there's usually plenty that can be done to fix this sort of problem.
The boiler is a Vaillant 242e, the boiler was here when i moved in and that was 5 yrs ago.
The pressure relief vavle is still leaking which is making the pressure to drop.
If i turn the hot tap on the boiler makes a loud noise as if it is going to burst.
the temp. raises past 90 degrees and then the boiler goes into auto swich OFF. I have to wait a few mins till the temp goes down and then reset the boiler.
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