Is this phal sun damaged?

[sunbirdx]

Hi All,

So first, and intro about this plant:

I bought it as a severely neglected little plant. It essentially had no anchoring roots, only arials. I have had it for several months now, and it has put out new arials and grown a leaf. It is trying!

Just today, I noticed one large leaf was starting to turn yellow, and another was getting yellow near the margins (the third, small yellow leaf was near the bottom, I assumed it was getting ready to fall off). I unplanted, the roots look okay, a little dry (almost time to water, we water once every 7-9 days). What do you guys think?