I have questions about the biasing network surrounding Q4. R9 and R10
are specified as 1.2K (1200 ohm). The schematic states that the
emitter and collector voltages should be 3.0 Volts. However, my version
develops an collector voltage of 7.2 Volts and an emitter voltage of 1.7
Volts. My base voltage is 1.8 Volts (which is in the ballpark of what
the schematic states as should be 2.0, I am not nearly as worried about
that one.

The voltages on the schematic are wrong.
Whatever the base voltage is, the emitter
should be 0.6 to 0.7 volts lower. Then
you can calculate the emitter current as
Ve/Re (around 1 mA in this case). The
Collector voltage is approximately Ie/Rc
lower than the supply voltage, or something
around 7V here.

The fact that your emitter voltage is only
0.1V less than the base voltage says that
either the transistor is bad (which you seem
to have eliminated, you have a bad or wrong
value component, or a wiring mistake.

I'd suggest disconnecting C15, C16 and
C17 to isolate the stage, and repeating the
dc measurements.

73, John - K6QQ