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Hi, my son has a 2004 which is a 1.4 auto, could someone tell me how to change the transmission fluid? It’s slipping and struggles to reach 70 mph-revs rise but not in relation to road speed. I can’t find the auto trans dipstick , googles not helpful either.Its done around 115k and I doubt if the trans has been serviced since new, any advice is appreciated

The auto box is a lifetime fill from new (no service schedule). Please see one of my other threads on my experience with it.