GE LM6000 IGV Difference Alarm while running. But both A and B sensor match perfectly in calibration. Can run in manual in calibration mode and walk IGV up by 10% all the way to 100%. Both sensors match perfectly. Run engine and we have difference alarm. We've replaced one of the IGV regulators and no change. Our IGV bushings have a little movement but nothing crazy. We tried to adjust the null bias on the servo card during a calibration, no luck.
Any ideas?
Any ideas?