Replace h707 and H708 with 1N4448 or 1N4148 diodes. The banded end goes toward the center of the board. Take 2 1N4448 or 1N4148 diodes and connect the banded end of one to the non-banded end of the other. use this 'stack' to replace H709. The lead from the banded end goes in the hole between the two pots. I wish I had a better picture.
Replace h707 and H708 with 1N4448 or 1N4148 diodes. The banded end goes toward the center of the board. Take 2 1N4448 or 1N4148 diodes and connect the banded end of one to the non-banded end of the other. use this 'stack' to replace H709. The lead from the banded end goes in the hole between the two pots. I wish I had a better picture.