My own experience of a 'Healing Attunement'. I'm not sure if there is such a thing, but I'm not going to quibble.
Years ago, I recieved level 3 which allowed me the ability to pass on an attunement to another. Ever since that weekend, I've not given one. Why? Probably because the situation never arose for me, or that I didn't go about in pushing for the thing to happen(which seemed wrong somehow; each and everything in its own time)
Now recently, I met through the boards a friend(now) who showed curiosity and willingness to share a reiki distance healing. Which went well, I have to say (and am appreciative of the experience)
So, we chatted some and discovered our mutual level of Reiki. So we conferred and decided to do a distance reiki attunement, for healings sake, instead of an ordinary distance healing.
It was a good experience, I find that things are surfacing that had been going on for years, but am now in the frame of mind to do something about. A cleansing and all the usual stuff from an attunement as well.
Since I've already been attuned to reiki, this feels like a refresher, or a re-affirming of my reiki path.
To my mind, my experience leads me to realise that I've had a reiki healing attunement.
It springs to mind that an attunement to reiki will put in place the ability for a healing to occur.