I seem to remember reading in the manual that the button with the red light built into it is something to do with a pressure test for trailer hydraulics or something, anyway since then the manual got wet and fell to bits and now the red light has come on all the time, anybody got any ideas whats going on?
 
Have just found out that it means ive no vacuum in the servo, however that stopped working months ago so its a bit of a delayed reaction.
 

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