Often it's thermal cycling around parts that cause the solder joints to crack. Our Bosch dishwasher failed and putting the board under a microscope revealed cracks around four legs of one part. Resistors often are undersized and overheat too. If you can pull the board it is easy to examine the joints and a quick touch with a good soldering iron (temp around 700 degrees and rosin core solder) may save you big bucks on a repair. Don't hit it with a HOT iron, you'll destroy the board, as will acid core solder.

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