Should boiler pressure still drop slightly after leak fixed?

Hi 2 weeks ago we had a leak coming through the ceiling of our downstairs neighbour. An emergency plumber was called and the floor boards ripped up and the leaking pipe located and fixed. The boiler was topped up to 1.5 bar. Just over 2 weeks later the pressure has dropped slightly to around 1.3 bar. Is this to be expected or is it worth having the pipe checked again before we have our laminate flooring put back down? Thanks Michael