I have a 2007 v8 calais international. This morning got a fault for open circuit on cylinder 2 injector. Still need to do a few more checks to narrow down the cause in case it's wiring or something else. But if I replace the injector what tips, helpful pointers do people have? I've learned these motors have a fuel pressure release point, so that helps instead of pulling fuel pump relay and turning it over to remove fuel pressure. What else should I pay attention too? Been a very long time since I've switched out injectors.