The latest is as follows:

RPV/Yarra Trams/CYP have run a full review of all the documentation associated with the build and cross checked it with new measurements taken on the tracks as built.
There is no clear defect or construction issue that would cause the level of noise that you’re currently experiencing.

Yarra Trams are in the process of putting together a trial of the potential application of a friction modifier to the rails to see if that has any effect on the noise levels.

We’re just waiting on confirmation on the timing of the trial. The trial will establish if the product is a safe and efficient solution going forward.

We’ll update when we have more detail on the timing of the trial.