Might be worth flushing it out well and then turning off the water and opening the flush valve and seeing if you (her) can get a picture of the elbow. If there's a ragged edge on the pipe, or some glue built up, then that would be a warranty issue and not by 'design'.
If you can't get a pic, it might be worth buying one of those borescope cameras that connect to your phone and using it to get a look at it. They're really cheap.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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