I couldn't find any prior to the crash.
Given that the 747 had been in service 26 years at that time with no previous problem of that nature and given that they could legitimately re-create the alleged problem under test conditions and given that it hasn't happened since, I'd say it was a total fabrication, as was the NTSB's ridiculous video claiming the plame climbed an additional 3000 feet AFTER the explosion.