If the heat cycle does not work and your a member of the AA breakdown i know they can plug their laptop into the ecu and turn the light off for you :-D
I know this because a mate is a patrol and has turned mine off a few times after i have been working on it, as mine does not go out after a heat cycle
If your not a member may be worth stopping and asking a patrol if he would do it for a drink

unless your on good terms with your dealer as think they would want to charge you for turning it off.