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    GE Refrigerator ZISB420DMB Noise when condenser door closed

    Hello, I have a GE Monogram 42" Built-In Side-by-Side Refrigerator, which has a lift-up door on top for access to the condenser and control board. The refrigerator sounds normal as long as the lift-up door is open but, when I close it, about 30 minutes later I start to hear a slight knocking...