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If you act like you are starting a cycle and change it to a different one are the times the same? Can you get me the model number from the unit, please? It should be on the right side of the door.
It does sound like a heating problem but most of the time if it does not heat to the correct temp it will change the times of the cycles. The heater can not be direct tested and your control can not be easly split apart to check for burns. If the unit is less than 5-years old the control may be under a part warranty. (check the warranty page in your owner's manual) It maybe time to have a teh out to do the electric measurements to confirm control or heater. If you call Bosch(NNN) NNN-NNNNthey can get you hooked up with a local servicer. Give the servicer this part# XXXXX and see if they can have it on the truck.