The phones socket insert switch is operating correctly.
Feeding signal in direct or selecting FM tuner , preset frequencies on
the display but no audio out.
The minor DC rails seem ok except the supplies to the +/-15V regulators.
Schematic shows the raw voltages should be +/-17V in use, but measure
-25V and 23V and only 18 to 20mV dropped over the
..47R fusible resistors in line . So looks as though little or no loading
of those rails.
About .2 amp stable draw from the mains and the main h/s is warm after
10 minutes or so