Well if you have the manual for your WE-800, the modulator was IIRC a simple phase modulator, very simple, very easily serviced, all discrete components, no IC's in the modulation system. You might be able to fix it easily.
The modulation system consisted of an audio amplifier and a variable capacitance diode, that's it. (Well, a couple of coils too but w/o them it won't transmit, let alone modulate)
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