Would holes in copper piping laid in cement floor always cause boiler pressure to go down?

I suspect that my underfloor copper pipes that are most likely laid unprotected in cement may be leaking incredibly slowly...pin holes. I understand how corrosive cement can be to piping. When I bought the property there were unexplained damp patched on internal walls and I think a small portion of my laminate floor is discolouring, although it is subtle. My question is, if the boiler pressure remains stable, is it still possible that there may be very slow leaks from these pipes or does this render a leaky pipe situation very unlikely? Many thanks.