Engine warning light staying on.

[Guest Trevor]

Hi, I have now had to take my 2017 NC 750 DCT back to the dealer twice with the engine warning (Orange) light staying on. On both occasions the error codes are reported to be firstly the front brake sensor; cleaned and reset on the computer. Secondly (some months later) the rear brake sensor, cleaned and reset on the computer. The dealer says there was some dirt on the front sensor but rear one no obvious reason? 

Just a little concerned as my bike is kept in immaculate condition, garaged,  used once in the rain and only has 4000 on the clock. Cleaning obviously means good use of a brush and hose could that be the problem as the latest episode appeared after a good rear wheel and chain clean!

Anyone else having similar problems?