FAA AD AD 99-27-15 of 11 Jan 2000 (
link) a situation applicable to GE engines on the 777 addressed a known fault
"....applicable to certain General Electric Company GE90 series turbofan engines. This action requires visually inspecting Ps3 and P3B sense lines and full authority digital engine control (FADEC) Ps3 and P3B sensing ports and fittings, cleaning Ps3 and P3B fittings and sensing ports, purging the Ps3 and P3B systems of moisture, and, if necessary, blending of high metal, nicks, burrs, or scratches on Ps3 and P3B fitting threads. This amendment is prompted by seven reports of loss of thrust control due to corruption of the signals to the FADEC caused by water freezing in the Ps3 sensing system. The actions specified in this AD are intended to prevent loss of thrust control due to corruption of the Ps3 and P3B signals to the FADEC which if it occurs in a critical phase of flight, could result in loss of aircraft control."
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It's not beyond credibility to see that the same situation could apply to the air and fuel pressure reference lines in the FADEC(s) attached to an RR Trent engine - as pointed out at:
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http://tinyurl.com/2nx3ym
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