A frequency modulated signal is available at the output of the Mixer/Amplifier block at tp34. Check that it is present by monitoring this waveform.The Frequency deviation is quite small so if you have an X-expansion control on your oscilloscope you can adjust the timebase to display about 20 complete cycles. Expand up the rightmost cycles on the display. There should be a slight uncertainty in the positions of these cycles indicating that the sinewave at tp34 is being frequency modulated