[Boatanchors] Yaesu FT-757-GX diodes

[k8omo@juno.com]

  My old reliable Yaesu  757-gx serial 4E071453 has given it up , won't
transmitt on any band , you can hear the oscillator and ssb audio, cw, in
another receiver , but no  measurable output.
and no audio on receive 10meters FM. This I have been told is because
some diodes have broken down. 
    What I need to know is what diodes are to replaced ???? on the RF
UNIT or other places. 
Please some direction ??
Thank you
Don K8OMO