The flat I am about to rent out was perfect except I had to renew a clamp on the shower. All done by a friend but when I went into property today there was a small puncture hole in the shower tray. Some sharp object must have been dropped. I panic at the thought of water seeping through to the flat below. I don’t know if it is pierced all the way through but it needs fixed. What are your recommendations please to repair this. New tenant moves in on Friday.