I'm working on a Deere 850K dozer, S/N 1T0850KXTFF290966. It will present active codes after operating for about 30 minutes, sometimes it will throw 1347.7 (high pressure fuel pump pressure control valve circuit fault) and sometimes it will throw 157.1 (rail pressure extremely low). I pulled those from the diagnostic menu on the machine. I have Service Advisor but I do not have the EDL to connect. Anyway, when I tried to look those codes up I cannot find them in SA, I looked under both serial number ranges and came up with nothing. Am I just not looking hard enough lol? Or does anybody have any ideas? I changed fuel filters when I got the low pressure code, but one code or the other still pops up after a little use. Any help would be greatly appreciated!