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Got my GU serviced before my Lithgow trip last week and noticed the EGT's topping out at 600+ and boost only reaching 10psi. Stopped and changed it up to 19psi and going great.
Why the mechanic would drop the boost is beyond me. Probably the apprentice stuffing around. Anyway my EGT's were pretty good after that.
Also agree that too much attention is given to the ETG temps. I might change my alarm to 700deg also.