Cymbidium orchid leaves discolored. Fungus? Underwatered? Over watered? Please help

[Nmari]

Hi
I received this miniature cymbidium orchid from someone who didn't have the time to care for it. It seemed ok but had a few scales on it. I repotted it a few weeks ago into a bark only (recommended for my region, Melbourne, Australia) and have had it in bright indirect sun since then. It tends to be a warm spot that's fairly humid as it's under a verandah. I sterilised the secateurs first with metholated spirits. I've watered it a few times a week since then, not allowing it to sit in water. It's dinner here and we've had some very very hot days. It developed these spots both on the ends of the leaves and on the body of some of the leaves and one turned yellow and soft. I don't know if I've watered too much, too little, or it has a fungus or other infection?? There were some nice green roots when I reported it as well as some dead ones, which I cut off. The origins of some of the roots have been visible between the ball as the bark has moved. Please help!