So there is a procedure for the shaft, might it be wrong or right, who knows. What is done about the emergency lubrication system that failed as well, or at least indicated that it failed? Are there changes in the design of that system?
From
AAIB Special Bulletin S2/2013 p6:
The helicopter manufacturer is planning to introduce replacement pressure switches with lower thresholds and tighter tolerances, as well as improved maintenance procedures, that will provide the crew with an accurate indication of the status [of the EMLUB system] over the entire operating envelope of the helicopter.