I just laid some porcelain tile over ditra in a bathroom in my basement and I noticed this morning that one of the tiles didn't adhere well on one side
. 2/3 of the tile is solid, but one corner has the hollow sound. Unfortunately it's right in the middle of the room, so it will get plenty of traffic. I haven't grouted yet, and I installed it as Porcelain over Ditra over Concrete slab using some good (Mapei) unmodified mortar (I think it's the Kerabond).
Anyhow, I'm just wondering from your experiences what the best way is to deal with the tile. Should I break it out and set a new one now while it's still easy-ish to do so? How hard is it to lift a set tile off of Ditra without disturbing the neighboring tiles or the Ditra itself? Are there other methods that are good for filling in under the tile in place (epoxy, thinned out mortar)?