...are the two fuel flows identical and what are the 2 fuel flows at identical temps? It could be that a temp probe has gone short circuit.
Don't think so. The probes are wired in parallel, thus a short (actually a cold junction) affects the
entire thermocouple circuit, not just one probe. The error would be huge - several hundred degrees.
An
open thermocouple in a parallel array could result in either a + or - error, depending on whether it's at a hotter or cooler spot in the circumferential temperature profile. (The temperature of the gas is never perfectly uniform around the case.)
For that matter, fuel flowmeters have been known to disagree. For one thing, make sure both flowmeters are THE SAME p/n. I once diagnosed a flowmeter mismatch by remote data - 5000 miles away!
