Black spots and root rot

[redwingirl]

All, please see my pictures for the challenge I'm having with my orchid. My parents sent me a lovely orchid from Hawaii. We believe it's an Oncidium (sp?). I went to re-pot the plant and noticed that it was suffering from root rot plus it had all these black spots on the leaves. Slowly but surely my leaves are turning yellow then brown. I did remove the dead roots with an exacto blade that was properly sanitized and sterilized, etc. I'm not sure what else to do at this point. Can my plant be saved?