Leaks after pump is turned off, and portafilter is removed

Howdy.

I just stated using my Barista machine again after its been sitting about 6 years. Seems to work good, coffee taste great. Steam light goes out a little sooner then I would like but it works.

But after it pours out the coffee and I turn the pump off a little bit off water continues to leak out of the boiler. Even with the portafilter removed. Its getting messy enough that it annoying.

I ordered some descale and some tune up parts. valve, seals, etc.

What steps do you recommend to isolate and resolve the leak?

Thank you.