I can't for the life of me, find any info on how Spirits can be healed. Anyone have a reference?

Thanks.

P93 of the Companion.

They heal just like a human does, though not that convention first aid does nothing for them(and depending on your GM you might need specific spirit healing spells).

When is a spirit is disrupted they can return to the real world after 28-force days, or when they are fully healed, which ever comes later.

There is a little more too it then that, but as mentioned above Runners Companions has all the info.