yesterday  car went into limp mode pulled over switched off then back on all ok drove home no probs.today went out only to aintree ,on way home auto box came on again into limp mode again so pulled over switched off  then back on all ok then about 10mins later done same thing again ,the question is do i take  it to a local garage  assuming they could hook it up to diagnostic. or is it a gearbox problem have been told that selector gear in speke are top guys with autoboxes any advice  or help in the right direction would be greatly appreciated  .was planning to take family out fri guess thats on hold also  i have had the auto box box topped up with dexron 3 ,theres a slight leak towards the front of the sump thanks in advance

the level has been checked and is ok , and it did rev up ,all this is stressin me out

As TB says you may need to get it plugged into tech2 to read off codes.
When mine went the symptons were.
From cold start, no problems. Drive ok up & down the gears.
Then after a couple of miles when car had started to warm. The check autobox light would come on & the car would go into limp mode.
Pulling off the car would rev with little in the way of drive unless you manually shilfted. But would only go up as far as 3rd.
One noticebale thing was, when i sat on my drive & started it from cold, i would sit ther with it idling until it warmed up with no problems. Then I would manually go through the gears. When the cvar got hot the fault would re-occur.
One tell tale was there was a hydraulic sound coming from under the car as i went from 1st to second.
After drawing a blank with my usual garage & a "specialist" who was only interested in changing the box not pinpointing the fault, I opted to change the box myself.
Took my time over it and so far a year later all still good.