Hello, everyone! Thank you so much for your support and knowledge!
I have not yet tried the H2O2 test on the medium, but I will do that tonight.
The skewered leaf is yellowing further, which is to be expected. It's actually the third leaf, with two smaller leaves underneath, one of which is quickly yellowing.
I've been too scared to unseat her, but I watered her with Feed Me fertilizer yesterday, and I will try to unearth the inner pot tonight, and see what's going on down there.
I didn't know about velamin, that it absorbs so quickly! I'll soak some more bark mix tonight and transplant her probably tomorrow - I'll take exposed root pictures. Question: the Feed Me fertilizer from repotme.com is specially formulated for orchids - do I need to dilute it to 1/2 or 1/4 strength for weekly watering? Another question: do you think my overhead fan left on all day provides sufficient or excessive air circulation? The orchid sways a little in the air flow.
I saw the 'Not all dead roots are dead' post - will definitely help in selecting proper roots to remove. Hey, when I cut the decaying roots with a sterilized instrument, do I need to treat the cut ends with anything? I know the cut tissue is vulnerable to disease, and that cinnamon dries out the tissue too much. Any thoughts?
I'll need to tell the lady who gave me this orchid to stop using ice!
I didn't know that about the hairs! I thought roots like this were diseased.
I'm glad to hear that JAI orchids are generally healthy
Thank you all for your comments and great advice. Your pictures and experience are invaluable.