The difference in price for the whole door assembly and separate parts is about 15 bucks. In my opinion it's better to replace the whole door due to safety issues (the door is protecting you from the radiation leakage) and possible damage to other parts during repairs.
- The part number for the white door assembly
AP3137856
- The part number for the black door assembly
AP3140006
- The part number for the biscuit door assembly
AP3137857
- Here are the break down diagrams for the Whirlpool microwave
Model GH7155XKB0
Gene.