New Phal leaf wrinkled, yellow and drooping

[natasha_moth]

Hello everyone,

I am happy to join such a knowledgable and friendly community of orchid enthusiasts. My first phalaenopsis was purchased about a year ago and after its beautiful blooms finally ended a few months later, I cut off the then-empty flowering spike. In the summer it grew a new leaf, which grew fairly quickly and appeared healthy.

Then, a few weeks ago, I went out of town for two weeks and left the orchid with a friend for caretaking, instructing not to "over-water," as the phal is in a plastic pot. Alas, I think this is what may have happened, because upon receiving the plant again, its most recent leaf was limp, droopy, and much lighter in color. Then, over the course of the next week or so, the leaf began to get more yellow beginning at the base, and more wrinkly. I finally repotted it yesterday, in orchid potting mix. The roots were yellow nearer the base and greener near the ends, but almost all had about 1/4-inch of mushy roots at the tips, which I cut off. Even though the rest of most of the roots were yellow, they were still firm and so I left them on. Repotted into a plastic pot.

A few questions:

1. based on the photos of the yellow, wrinkled and droopy leaf, does this appear to be caused by over-watering, or something else?

2. Now that I have repotted it, how long should I wait to water it again?

Thanks very much for your help!