Concur...No relay click and mV on those resistors indicates a failure in the protection circuit.
Problem could be anything like a failed/out of spec cap, transistor, diode, relay or even
a dry solder joint. Will need to get some test points for voltage measurements.
What do you mean by diode check? I have a diode setting on my meter but I've never used it. Using that across the transistor, base to emitter and vice versa, i get 223 millivolts. I'm not sure if I'm dong it right, though.TR702 2SB544, b,c,e makes 14.3V on b and e. I always like to see that 0.65Vbe.
The collector drives the relay. -0.5mV is not going to do it. Please diode check
TR702, in circuit ok, looking for a b-e short. If you have a suitable replacement
you could try it.