If you mean this schematic, then D11 is the important one to have in place.
It is highly unlikely that all the diodes would have failed. If you can grab one of the old ones and place it there, you should see a significant reduction in the heating of the transistors.
It is highly unlikely that all the diodes would have failed. If you can grab one of the old ones and place it there, you should see a significant reduction in the heating of the transistors.