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Bad news guys. Cyl #5 is 12% down on compression, so it's gotta come all the way down to see what happened. Gonna call him and see what he wants to do.
#6 is about 5% down on compression, but no miss and no codes.
All the fuel trims are right about the same - even #5 - except #7 which is +25 or so, yet #7 never misses and has fine compression.
A valvetrain problem in #5 could cause a bunch of stuff, but since it's not way, way down I bet it's more cylinder issue. Perhaps will will soon see...
ASE Master, L1, T2, Own some modded Cummins trucks and work on them all. I have a Ford IDS if you are near...