Well I just had Audi Roadside Assistance come out and look at the car. 

They found the brake fluid level was just under half full, hence the warning lights.  No leaks that could be seen.  No explanation though why the front right tyre is getting hotter than the front left tyre though.  The car isn't pulling to either side when hard braking and feels fine.

Hopefully on Friday when they do an investigation at the Audi Dealership they might find something else causing the difference.

The REALLY odd thing is that this morning from cold, the front right was still 2 degC higher than all 3 others, and 2psi more (despite me aligning them all on Sunday and verifying with 2 pressure gauges they were all the same).  Mystery!


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