Boiler Pressure release valve leak troubleshooting

[GG_Mass]

Is this the regulator you're referring to ? this is 3.jpg at the OP.

https://terrylove.com/forums/index.php?attachments/3-jpg.97766/

 

[GG_Mass]

I'd also add - I'm thinking about calling in the pro, as resolving this does not seem simple. It would be nice if the OP question at least would be answered - is the plate heat exchanger a reasonable culprit when it comes to the issue I'm dealing with ?
Thank you.

 

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[Fitter30]

Regulator post 1 middle pic the one with the blue tag