my boiler pressure keeps going up?

We had a leak in one pipe under our floor, it was repair.
But when we turn the boiler back on, really slowly the pressure goes up (in 1 day can go from 1 to 2.5). There's a little, really small dropping of water under the boiler (5,6 drops a day).
I am not sure what to do, ask the insurance company to come and have a look at the leak again or call a corgi registered person to fix my boiler.