Inject 3Mhz into antenna
Mhz set to 3Mhz, preselect set to 3Mhz
Band set to B
Am set to AM
ATT and tone set to normal
Dial set to 0Khz
S meter reads 9-11

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Lock LED is lit, will not go out (goes out above 15Mhz). The LED is driven by the Darlington pair Q110 and Q111. When there is enough voltage (>0.5rms) present at TP110 then this is enough to extinguish the LED. Therefore, you are not getting enough signal down the Q107 to Q109 amplifier chain. Q111 will be on and the LED lit with its base drive supplied by R131. But when Q110 gets enough base drive to turn on, it will remove the base voltage from Q111 and the LED will go out.

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TP101 = 58Mhz approx 350mV pk-pk This shows that the Q201 oscillator stage is functioning correctly.

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TP103 = 0hz ?approx 0mV pkpk Here is certainly one problem. If you are injecting a 3MHz signal into the antenna socket then you should be able to see this at TP103. So the signal is getting lost somewhere between the antenna socket and TP103. Check at the input to T102 and then at C101 which is the input to RF amp Q101. After this there is the LPF which is that rod with several coils.

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TP104 = 2.5Mhz approx 100mV pkpk This is at the output of the second mixer Q105. For a signal to appear here this is likely coming from the signal you see at TP101 which gets fed two ways, one of which ends at the first mixer which is Q102 and Q103. Try looking for this at VR101. After this the signal will progress through T105 T106, Q104, T107 and T108 then Q105 before appearing at TP105.

TP106 = 1Mhz approx 800mV pkpk This is the output signal from the sealed box under the chassis from the crystal oscillator Q301. So this is working

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TP107 = 0Mhz approx 0mV This suggests that Q106 which is the IC on the board, has died. This chip mixes the 58MHz and 2-3MHz signals and so if this is dead, there will be no signal at TP107 ( and neither will there be enough signal at TP110 to turn off the LED)

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TP109 = 0Mhz approx 0mV This reinforces my guess that Q106 is dead since this test point is on the end of the chain starting at Q106. You should be seeing the output of the Q106, Q107, Q108 and Q109 chain here.

TP110 = 52Mhz
(TP104 with Mhz and band set to 28Mhz = 52Mhz 200mV pkpk)

I am puzzled about this result. If there is no signal at TP109 then there will be none at TP110 either.

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As to there being no sound output try touching or injecting say 3KHz at the centre connection of the AF gain control. That at least will prove the AF PA stage and associated components.