Bluezone they may claim that the drain line was kinked or restricted after their install.

They may but it wasn`t installed properly from the start.
Hose was never put on all the way onto the collar and clamp wan`t even tightend. Again "Haste Makes Waste" just to much in a hurry to check all work before closing the cabinet up.
If it was checked it wouldn`t of happened,period.
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"If there must be trouble, let it be in my day, that my children may have peace."