In message , Bert
Coules writes
Tim Lamb wrote:

Umm.. Is there no way of discovering the floor make up without damage?

But one plank is already damaged and will (presumably) have to come out
and be replaced. Apart from drilling though it and injecting something
to fill the gap (which obviously won't be effective if it's the
underlying structure that's dropping) I can't think of any way of
examining and hopefully fixing the problem without destroying at least
one plank.

OK Bert. I've caught up:-)

Assuming they didn't run pipes under the kitchen units, you will have a
return board where you stand to do the washing up. These look to be less
supportive than the straight runs.

You could find the pipes by use of an infra red thermometer. It might be
better to inject a cement slurry rather than an expanding foam.

--
Tim Lamb