Land Rover Repair: Transimission light comes on after driving few miles, hub assembly, 3 amigos

Question
Hello
I have a 2000 Discovery. The transmission light on the right side of the dash  
comes on and sometimes stays on.  I took it a local LR shop and they told me
it since the 3 amigos are lit, it is all interrelated.  The gave me an estimate of
$900 and said they we need to change the Left Front Hub Assembly.  Are they
right? Please help.
Thank you
Jr

Answer
Front hub problems don't normally cause the transmission fault light to come on, but it's possible.  Do they have a Land Rover test computer or is their diagnosis a guess?

I have never seen a front hub cause a gearbox fault, so I'd be a little bit skeptical but I'd hesitate to say more than that without seeing it.