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Whenever the wrong value part is installed in a set it usually means one of three things:
1.) Production change. Midway through production part values are sometimes changed to reduce the number of sets that, after being built need further work to function well enough to leave the factory. In short to lower the dud rate.
2.) Technician compensation. Sometimes repair techs who can't locate the source of a problem will change the value of a correct part to fix it. Basically treating the symptoms not the disease. It is bad practice, but is sometimes the only way to get the job done.
3.) Human error. Someone could have accidentally installed the wrong value. Or you are looking at different capacitor in the circuit than the one you think you are looking at (I've done that more than once).
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