1) fuse socket loose
2) 3 legged degauss resistor if used. Usually marked TDK.
3) on/off relay or pins.
4) AC input choke or pins
5) other things I dont remember !!
If not obvious darken the room & tap around & bend the PCB to get it
to act up. When it does you should see it.
Good luck
73 Zeno
LFOD !