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Thanks SinStp for the explanation of the first step

It can be as simple as:
1) Replacing the final
2)Remove R55, R56 and C61.
3)Add a 68Pf cap accross C59.
4)Install a EN1230 ( for the ERF2030) or a EN369FN (for the IRF520)
in the R56 spot. Correct polarity for both is with positive(+) torwards R123 (front of radio when installed on the component ...