Lower radiator hose replacement & warranty ?

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Lower radiator hose replacement & warranty ?
I have to replace my lower radiator hose.
I crawled under the truck and I cant see the hose clamp where it goes to the water pump.
Do i have to remove some stuff to get to this thing?
While I'm doing this should I replace the factory clamp or are they usually good to go?

I also have a question about the warranty on the hose.
My truck has 22K miles on it.
All of my other vehicles have had pretty much everything covered until 36k.

I had the truck in for bedplate gasket repair at 16k several months ago and got it back with a coolant leak. It was pretty small but I wanted it fixed.
I took it back 4 times and they said they could not find the leak.
7 months later (I work out of town and don't drive this truck much) I put dye in the coolant so they could find the leak.
I took it in yesterday to the dealer I have been dealing with for 10 years and they called and told me that the lower radiator hose is bad and it would be $300 to repair.
I told them that it was a preexisting problem that they caused to begin with but they would not fix it.(My service writer retired a month or so ago).
Anyways... I'm pissed about it but now I need to repair it myself I guess.
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