Talk to Doctor… Lassau? Lessau? The doctor in the Steeltech Lab on Uveto. He can't fix Amber, but he can help make the cure cheaper by running some scans.
The orange gabilani is Lumi, she's a random encounter on Tarkus, just run around on the dangerous tiles until you run into her. She's the one that does the actual mad science stuff to cure Amber.
Then you'll have to find a bunch of 'taurs (at least three, but if you find more, the cure gets cheaper), bring the samples back to Lumi, and then you have to wait for a while until she emails you.