Hi.
Just popped in here and spotted this.
The electronics on a T-40 are far from standard.
If you have any experience of soldering, you may wish
to have a go but you would have to be careful in what you.
This is the earlier type and would include 78.
Straight forward, three wires.
The switches are easily available but is may not only be that.
Could be a dry joint - broken cap connection (I've had that before)
or several other things, including a dead pick-up.
Take clear images before you start, so you can double check later.
Cheers.