Ditto the vespel drive failures which required an immediate landing according to the RFM of the time.
Sorry HC, but you are wrong. The S92 RFM has always had a Land Immediately requirement when the MGP Oil Px is below 5 psi. A single vespel spline failure/oil pump failure did not produce an Oil Px indication below 5 psi.
Also the first churning event produced a number of (startling) indications that resulted in the crew electing to carry out a forced landing, however it was not an RFM instruction but an airmanship decision.