I have a SFTR chassis that suffered a similar fate. It was given to me, the rest of the amp, cabinet, speakers was destroyed in a fire.
The transformers were fine, and they are in a 100 watt HRM build now.
Some of the pots were usable, some not. Some didn't work anymore, some were just way off value.
I haven't used any of the caps or resistors.
I just checked that auction again since posting it and it's gone up to $204. I was not expecting this thing to bring in more than $100. I guess the chassis may still be good as well as a few parts like the trannies. I guess what it's at now may have been expected by people who collect old Fender parts. I don't, so I'm