Question as to the original issue with the SVX auto

[mid-knight]

Hay guys,
Can you tell me what the original issue was with the SVX transmission as to why it failed religiously, I do remember something about the filter and placement of it I believe and material deposits though out.
The reason Im asking is, Im thinking of perusing a very low mileage svx with less than 50k on it, if there is something I can do to prevent the known problem from taking place, it would be great.
Im aware of the heat issue/concerns, the cooler is a definite.