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A good starter test for shorted silicon recifiers is to ohm them out with an ohmmeter. If the short is gross, it will show up here prior to powering the set up.
I usually use the 20k ohm scale. There should be a reading with the positive/negative leads oriented one direction and an open when it they are oriented the other way.
In some cases, the electrolytics around the diodes may case erroneous readings, so disconnect one end to verify a short.
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