the machines that made the senica and cherokee for/at thompson burnt in a fire near 30 years ago.
Yup, somewhere around 1986~87 IIRC, but they serviced the Seneca for years after the burn. If you are the original owner, they will still stand behind their "lifetime warranty".
Actually, the TC plant fire was on 3/28/97. But that's close to 20 and 30 years ago.
While TC has one of the very best warranties in the business, it's kind of hard for them to replace parts they no longer have the tooling for - although I'm not sure TC even made the Seneca barrels in house. Regardless, their spare parts for the Seneca are long gone. What they probably would do is replace the entire rifle with a new Hawken/Renegade rifle if it was for a confirmed warranty problem with the Seneca barrel. I know of them doing that with both the muzzle loaders and the Contender/Encore, including a Contender frame for me once. With Tim Pancurak retired and S&W buying them out I don't know if they'll still do that though.
TOTW may be your only choice, and with some great caliber options. I've had a Cherokee 32, and Seneca 36 & 45. Favorite was the 36, but I would have really liked having a 40 on the Cherokee when I had it.