94 discovery 300tdi auto

hi all i'm trying to find a solution for a friend of mine, he has a 94 disco 300tdi. When its been sat for a while the auto box will stick in 1st. At times this will happen for a quite a few miles, then once it has changed the first time, it will change properly from then onwards. He has had the transmition fluid and filters changed, this has not helped. Any help would be great as auto boxes are not my strong point

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