Sorry only giving an update about what I meant with regard to the fitting! When you pop the nozzle out of the bonnet, to get the pipe off there is a collar that needs to be twisted in order to release the pipe. This is what I was having trouble with.
I tool it off and soaked in warm water for a while, Also blasted through with a compressor but it is still the same! Looks like it needs a replacement nozzle!