Hi all,
Thanks again for the replies. Quick update:
The droning noise was a wheel bearing, replaced and noise issue is solved. Cost approx £300 at the local indi for reference.
Did not fix the sports diff light though, coincidental. That turned out to be 2 sensors (temp and oil level) and 2 of the clutch / fluid valves controlling the hydraulics in the sports diff. That was sorted out at the dealer - shade over £800 (ouch).
Master tech confirmed that the main cause of the light coming on is electronics / generally sensor problems. From the research I did this seems to be fairly common across sports diff on A4s.
Cheers
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