Ahh yes , best be safe than sorry .....I'm just trying to sort the ones on Tony's atm ....There is/was no evidence of a leak on yours but seeing as the lump is out and all that is going into it really makes sense to put in new .
They all seem to go where they poke out near the fuel tank .This is where they are clamped and rest against the tunnel floor .Bit of 25 year old foam there that catches all the moisture and rots ....Also seems to be the LHS one that suffers .This has the heater matrix pipe right above it and is pulled down very tight .
Here's one I did a few months ago ,luckily they tend to go right at the end of the tunnel .Clamp is about 5" further back .Can't see the holes until they spring but hopefully I can do the same on Mr Smiths .