Sticking my neck out here because I've got no experience at all with modern tractors, but since no-one else has replied yet...
It did not start it right after the service. (I did oil and filter, fuel filter, air filter, grease and topped fluids.) I bush hogged for 3 or so hours and it came on (high temp ind). I checked the fluid level, fan and belt, while making sure the radiator was not clogged. And again after an hour or so yesterday the light came on. Repeat after lunch. Then got on after a break and the thing ran without high temp ind. for a couple more hours. Headed out to run it again.
thanks for the help