While I'm a good auto mechanic, this is my first time working on this. I'm attempting to fix a friends 2010 Kubota L4400 (I think it's a v2403?) that I found the injector pump to be bad. Number 4 cylinder just dribbles fuel out of the line. He took it to a Kubota shop and they verified what I found but in the diagnosis they said the pump needs to be replaced, "the number 4 fitting is spinning inside the pump"? This is what I need help with. What do they mean by this and is it repairable without having to buy a pump? He's bringing it to me tomorrow for me to pull the pump off and I figured I'd ask here for some advice. Thanks for any suggestions.