2017 WRX No Compression. I don’t remember which cylinder it was, since I stopped after I took this capture, but you can see on relative compression test I have a dead hole. The green trace is the Picoscope WPS500 inserted into the oil dipstick tube, fuel was then disabled and engine cranked cover. Due to a failed ring on said cylinder during the cylinders compression stroke that pressure goes into the crankcase thus the spike in crankcase pressure