CTC140 with random shutdown????
Check the connections on the diode SIP board in the main power supply. This is a little (about 2 inches) board standing on edge in the power supply. I've fixed hundreds of those sets by resoldering the connections on that little board. You'll need to take it off of the main board to do it right. I think it has 7 wires that connect it to the main board.
I've also seen a lot of them with a bad diode.....the big diode on that little board. I think it is part number 164589--someone check me on that as I am nowhere near a service manual right now. It'll test good with a meter, but try to suck an amp through it and it'll fail.
As said before, the thermistors on these sets seem to just fall to pieces. get a new one, p/n 207768 and you'll be good to go
There are other places that could have bad connections too, so get a strong light and take a close look.
Good luck!
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