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They are power transistors and NOT diodes as you assume. You can clearly see the E,C,B marking
once we know the voltage (JPG 007) at the Collectors pin at the left bottom, w.r.t., Emitters common pin at the top left, we can decide the transistor in all probability.
You have to measure on the wires coming to the board. If the board is working, you can measure on point B wrt point A, in the partial jpg attached, with points marked.
The schematic is attached below.
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