abs is working ok but on long journeys(dual carriageway) abs light comes on also when i have my toe down for a bit of a thrash it pops on.was checked while in for a service but as usual didn't happen when they took it out.cleared the memory and said they would have to start taking it to bits to find problem.light does't come on whilst braking.cheers in advance for any suggestions

 

well didnt they say what was in the memory that should give them a clue