Hi there. My name is Stefan. I'm an experienced audio engineer working in my own studio with a team of two co worker. We did similar jobs before, unfortunately I'm not in the studio right now, therefor I can't send you a sample right now, but I'm willing to do so tomorrow. (It's after midnight here)
We've done several restoration jobs, some you can see on my profile, always highest ratings and very positive feedback.
If you have questions feel free to contact me, also, once you send me a message I'm able to attach a sample for you tomorrow. Otherwise I'd have to edit the bid and hope that you would see it.
Kind regards,
Stefan.
Ps: we work with several spectral tools, should be doable to fix the audio, but I can't promise anything, without hearing it, so it'll have to wait a bit.