I have both the 727 and 707 working fine in P3D v2.

I didn't use the latest Migration Tool to install it in P3D v2, I copied everything over from FSX.

I do have the problem starting P3D v2, where it cannot load the default flight, or find the default flight file location, and so it aborts the loading, but I have a work-around for that.

The sound problem with the 727, which I fix in FSX by reloading the aircraft, is always present in P3D v2 - in other words, reloading the plane does not get the sounds working in P3D.