I have collected my car now and it's resting on my driveway

I have spoken to a Auto Transmission specialist in farnborough who will take a look at it tomorrow if I can get it over there (Not sure what further damage can be caused in 2nd gear? apart from annoying other drivers at 25mph)
I would love to be able to change the fluid / Filters but I wouldn't know where to start really but the specialist did say he would drain some fluid and check its condition as well?
I have a case logged with Luton to understand their thoughts on the gearbox failing so early in life but to be honest dont think they will come through really.
I have been checking my Vauxhall Service history and it says the Auto Transmission fluid should be checked / changed at 40k / 4years - I have looked at my copy from the last service at 45k (Nov07) and this has not been ticked which I take as not being completed? any ideas on this anyone? (Have I understood the schedule correctly?)
Thanks