Clunk is a fault

I OWN a 2000 Falcon XR8 that has done 65,000km, but has a clunk in the auto. It happens when slowing down when the auto clunks into first gear. I was initially told by Ford they couldn't find the problem, that it's probably just the auto learning the way you drive. But I have discovered that a service bulletin in February 2001 advised this was a common fault in these cars. It's funny that no one from Ford or FPV or any of their service people knew anything until I supplied the service memo. To cut a long story short, the valve body in the auto has gone and the cost is $1700 for the part alone without installation. If anyone else is having the same problem they should pursue it with their dealer.