FED
It was a cracked Visco Elastic Frequency Adapter (Damper) and if I remember, it was Peter Hall who had the failure in the East Shetland basin.
After that, there was no more 16.5 degrees of pitch and Laurence Bristow's famous direct ABZ to the ESB at 145 knots marketing ploy became more like 130-135 knots at 15.5 or 16 pitch if I remember.
In 1984, I moved down to the SNS and flew the 76 for many years, I much preferred the short range busy flights than flogging to the ESB in a 332L