I think it's better to address the power supply issue first.
If you suspect the thermistor causing the problem, install a new one and test if the problem goes away, then go recap the power supply.
If everything goes well, then go ahead to recap the phono board.
Of course they need to resemble in form to the ones I have in order to fit the Linn Linto PCB…
Totally agree! Measure the size and lead spacing of the existing caps, then choose the longest life with highest temperature rating. A capacitor with service life of 3000hrs@105°C is equal to 12000hrs@85°C.
For those smd electrolytic caps, tantalum capacitor is better if money is no object.