The BFM has the same plastic pipe carrying coolant between the oil cooler and the block that the D2 does, so almost certainly it is the same failure where the pipe cracks with age and heat.
Its a 4-5 hour job on a D2. I'm not familiar enough with the D3 to suggest what other stuff would take 12 extra hours to remove and replace, but tbh taking the bumper off one was enough of an ordeal so I can well imagine it being a 2-day job. For a £10 part.
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