Three radios. New power supply for the Turbo sounds routine enough.
The 2970 would be a pretty old radio if you think it's time for a re cap. The very-oldest ones would be close to thirty years old. As for the S-meter I'm sure there's a findable reason for that. Not a cheap operation to recap that radio.
As for the S9-350, it's a fair guarantee that one or more of the four ERF7530 MOSFET transistors in the linear has failed. Just one problem. Can't get them any more. Making a substitute work properly requires one or the other of two things. Either time and money spent to 'tweak' it so new parts you can buy will behave in that circuit. There are candidate parts out there to use.
Or find someone who has already worked out the tweak, and just copy it with new parts. That would be cheaper. If the info is reliable.
We don't have that modification on file here, so it would have to get worked out the hard way.
There's one more bonus. That amplifier will not tolerate any SWR at all. Whether it's an antenna with something loose on it, or a coax connector with a loose braid connection inside. It will be really easy to poof that one soon after it's fixed. Good chance that's how it was put into the damaged condition you described.
Just one obstacle. We don't do shipped-in repairs. Carry in and carry out only. The Turbo might be a same-day job, but not the other two, most likely. The appointment calendar is on the wall at the shop, and I'm at home right now. If memory serves, it's booked through the end of September.
Thanks for thinking of us and 73