I've been told the following, from a good source:
they forgot a special tool for the free play check at the 25hrs inspection, connected connected to the blade....that's why they had so much vibrations right from the start- up.
they find the tool (which is a bracket) 140 m away on the ramp....that's what they told me yesterday. If you ask your technicians they will be able to show you the tool (it's a support for the compass of a dial gauge) and you see the dimensions!
Blackmax you have got an email...
Regards
Aser