Get the serviceman back. A couple of things could be happening here.
1. The system appears to be over pressurised (too high standing
pressure) and this excess pressure is dripping from the pressure relief valve.
2. The fill valve on the mains supplying the heating system/boiler may also be passing leading to over pressurisation.
3. The expansion vessel may also need to be charged or replaced.
2. There may be dirt on the seating of the pressure relief valve leading to leakage.
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