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The boiler is off at the moment as I did think it may be the PRV, however the pressure is still dropping although slowly. How do I check / reset the PRV?

I have a valiant combi boiler. The heating circuit keeps losing pressure over a 2-3 hour period. This only started today. I have looked around the house for obvious signs of a leak but there are none. Is it possible for a boiler malfunction to cause the loss of pressure or can it only be a...