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Remove obvious debris from the top of each drain. Place a quart measuring bottle beneath a drain. Pour a quart of water in each drain. See if it flows out the bottom in the right place and amount. Next some dish washer liquid. And another quart of water. Then blow air through the tube. Do not use any sharp rigid implement.
Do not ignore the foam catch basin under the clamshell.
Diagrams and more complete suggestions thanks to Maurice/1stchoir link elsewhere in this thread.
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