SorryBrian we don't have this on yet as it is a relatively new product and we areonly just starting to get enquires for spares however I have provided you alink on the previous Q&A
It depends on the length of the run however 6mm should beenough
Check it out here http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html
It is only the clamp bracket you need to replace.
First switch the power off take the cover off and investigate where the leak is coming from.
From your description of the fault it sounds like you may also need a new relay board.