Bosch Dishwasher very long cycles

I have a bosch dishwasher that suddenly has very long wash cycles. Normal wash takes about 3.5 hours and power scrub lasts about 6 hours. After doing some research it seems the heater may be the problem. What kind of test can I do to troubleshoot the heater? And can the element be replaced or do I have to replace the entire assembly? Part number for element would be appreciated if replaceable.

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