Remove the bottom cover, locate the large, lone resistor marked R37 near the front center, (not far back from the face) and cut or unsolder one leg and shrink wrap in place.
It's absolutely the quickest/ easiest mod I've ever done.
More info: KB2LJJ Radio Mods Database
And, to make the tuner function on General Coverage:
Remove the top cover of the IC-
761 and locate the tuner band switch unit PC Board which is the 2nd small PC board located
behind the antenna tuner preset unit.
On the board, locate J 7 and at that location, you will note a three (3) pin molex plug with a black, brown, and red wire
connected to it. Either unplug, remove, or clip the center brown wire coming from the plug. Carefully unplugging the wire and
placing heat shrink tubing over the end works very well.
This enables the tuner to be activated on GENERAL as well as the ham bands.