After noticing a wet patch on my kitchen ceiling I lifted up the bedroom carpet above and lifted some floorboards to find a screw in one of the pipes. I found it odd that this pipe was so close to the board. Anyway I turned off the supply and removed the screw so in need of some advice on how to repair it. Can a plumbing novice fix this or do i need to call someone in? If it's an easy diy fix can some point me to what i need preferably anything available from b&q or similar.