Advice on possible root problem

[Lyn a]

Hi all! I’ve been growing orchids for a year now so still very much a beginner. I have had something happen to one of them that I think may be crown / root rot. I think I overwatered it when I re potted it but just wanted advice and conformation that I’m right. The bottom leaf has turned an orange colour and when I looked at the roots some had rotted but some are still firm and intact. There were no Ariel roots. It was potted with in an orchid mix which I think is bark based. I’ve removed it from the pot, cut off they bad roots and now have it recovering in a glass with a very small amount of water In the bottom. It’s a Phalaenopsis and is still in bloom with new buds and what looks like new stems forming. Any advice to help will be much appreciated.