Ernie
I will see if I cannot find it. go to
www.tcm.com. it is on their site. also do a search for ad's under the faa.
summary; the crank needs to be changed if the case is split or the engine requires overhaul. There were problems with some of the new VAR cranks as well and they had to be tested and/or replaced. About 97 if I remember correctly.
new crank is about 6k. (another way to make money as GMAS says there is no proof the old cranks were bad to start with).
Also need to check the cases. They made heavier crankcases and had an "H" stamped on the side. The earlier or lighter cases were prone to cracking.
fyi
bob