Is my Miltonia Sunset healthy?

[Bunny9129]

Hi everyone!
I am very newbie to the orchid world. Just found this lovely flowers in Fred Meyer and I am in love. I bought instantly but now worry that she maybe sick or unhealthy somehow due to the sad looking of the flower and some brown look on leaves. Also, the bulbs look yellowish to light green which worries me a lot. Since I bought her from Fred Meyer, should I try to repot? What medium should I use for this kind? I live in Seattle so the weather maybe wet through out the year but right now it’s sunny and around 70F. I tried leca beads for my first Phal and it did end well. The Phal kept getting root rot and died out. I am afraid to make the same mistake as this time. Any advice would be much appreciated!