PS Audio Power Plant Premier Service Manual page 13

FAN DRIVER REPLACEMENT
First check to make sure that all connections to the Main PCA are good.
Next check to make sure that the fan driver transistor Q6 is a BC337G and that it is
installed up-side-down compared to the silk screen on the Main PCA.
Use an Ohm Meter to measure for shorts between the Q6 transistor legs. If a short is
measured, look for a solder bridge between the transistor legs on both sides of the
board. If a short is measured and no solder bridges are found, replace Q6.
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