Phaleonopsis suddenly has yellow leaves

[Rojo]

Thank you for your quick response!

The pot is the original plastic one from the florist. it is potted in pebbels and tan bark. I never checked before, but it appears there is no drainage- no holes in the bottom of the pot.

It has been colder here than usual, but not drastically. I'm in Central California. I have never fertilized it at all.

Now I feel like a horrible plant mom!

I'm a little afraid to unpot it- i don.t know how to go about re-potting it!