Be very careful when working on the power board as it contains dangerously high voltages even when not connected to the mains. This is because capacitors can remain charged for some number of hours or days. Take all normal precautions before working in this area. In addition, handle the board as little as possible
Check the diodes with a continuity meter. If it shorts then it has blown and should be replaced with a 1 Amp diode. You should also test the two board fuses for continuity as one (or both) of these can be blown by the over current. You may also have to replace the main fuse in the power lead as this can go at the same time.
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