Working? ... Working?
To state the obvious: When the system is working correctly it works correctly.
The problem is not the big bucks paid to pilots to figure that out, it's the time a pilot has when it goes wrong.
In Glasgow: Engines out, backfiring noises, adequate fuel remaining, experienced pilot and failed autorotation. Reassurance from 135 pilots and engineers.
The explanation will not be obvious until it is known.