Good time for that LED upgrade
I'm not sure how your fixture is rigged but my Giesemann Infinity had an internal ballast for the T5s and two external ballasts for the halides. Any HQI or electronic ballast will work with the halides, you'll just likely have to splice cords together which is easy enough. The T5s will be tricky as a plug and play ballast will be hard to find except from giesemann. You'll likely have to rewire everything up to the connectors.
Also curious are all the lights out? Seems strange, does the fixture run fuses?