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Could be my mistake with semantics - but on mine, there is a black plastic micro on the valve to the left, and another one on the valve to the right - slightly higher up... I've found that my PRV is still dripping outside too - so either I put another new one in or flush it out... or both...

Would love some advice: I have the above boiler for about 8 years. Have renewed the PRV and it seems to have gone again - but with some clicking of the PRV is seems to have settled again re losing pressure - maybe some crap on the seal. But also, the Microswitch on the differential valve is all...