I Think that Riverman (post #137) may be on the money here, icing may not have been an immediate issue here but a contributory one to the sensor points/connections (moisture).
The fact that it was picked up by the FAA on the G.E. powerplant rather than a Rolls-Royce one (on the same aircraft design) should make little difference to the underlying cause. Just because the FAA didn't put out an APB on the Trent engine doesn't mean they're infallible to the same control/FADEC issues!... it just meant they hadn't dealt with them at that time.
Operators with RR's would have looked away (understandably), but the FAA's remit was only to explore what was going on in ITS (much bigger) aviation industry, where G.E. engines dominate, and had lead to previous (unrelated) issues (IIRC)...
And if this BA workhorse 'was' doing the same route fequently, then it looks likely (reading some of the above route-based posts) that moisture could have been a <contributory> cause in losing control ...at that time of descent, whilst the fuel pressure/electricals were working overtime!
just my 2p's worth!