I am having trouble with our 2007 200CLC excavator. This has been a reoccurring issue for a while now. The SN is FF200CX508911. The machine runs great and out of the blue the check engine light will come on and 2 active codes will show up. SPN 1569 FMI 31 and SPN 1076 FMI 13. There is one stored code SPN 1076 FMI 0. We have changed out the lift pump, injector pump, cleaned the grounds to the ECU and a few other small things. It was running real rough so I added a good dose of diesel kleen to the fuel and its running smoother. I am assuming it was a injector sticking. Another symptom is that when the codes appear the hydraulics seem to have a problem. Its hard to describe but they seem as though something is not opening and pressure is deadheading. Every function gets really slow, the engine rpms drop, sometimes stalling (dies) the engine like its loaded up and can't pull any harder. I understand the codes lead back to the injector pump and just want to make darn sure this is it since we have already tried changing it once. What could I be missing here?