I´m looking into the possibilities of exporting a Unity prefab to the FBX file format so that it can be loaded up in Maya and/or Max.
There´s a thread about it on the official Unity forums, but the first reply there contains a link to malware (Don´t click it!) http://forum.unity3d.com/threads/export-full-unity-scene-to-maya-edit-or-fbx.42620/
Some time ago, before unity had a lightmapper there was a free lightmapper kit that included an FBX exporter named External Lightmapper Tool or something like that. Also, if you only need to open it in maya there is a pretty good maya exporter in the asset store.
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/eric