B777 Eng Indications

[kimisabe]

gents,

wonder if any of you have any references to history of spurious engine indications for the B777 with RR Trent engine?

did some searches but nothing seem to turn up?

any help would be much appreciated.

kimi

[gas path]

such as?:confused:

[N1 Vibes]

Refraisal tin foil from reverser halves contacting EGT probes causing EGT fluctuation. Very old issue.

Or something else maybe?