The plant was fine until a few days ago when i finally brought it outside. It has spent all of winter indoors in the same pot.
The browning on this one greatly differs from the one that has salt burns, this one is a much more mild, greenish brown, spread evenly throughout the leaf.
Also note that the only leaves affected thus far are the ones facing the sunny side.
One more leaf is just starting to brown, but hasn't started to shrivel up yet.