Here is the tech bulletin. Your appliance service person should know about it.Repeat failures is not exceptable (at least not in our shop). You may need to find another repair person.
PDF file to big to attach I pasted relivent page without the picture
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For Immediate Attention of Your Service Department TECHNICAL
SERVICE
POINTER
Technical Service Pointer #: W10632338
Action Required: Informational/Mandatory
Release Date: August, 2013
Refrige
Page 1
Brands Affected
ALL POINTERS ONLINE:
https://www.servicematters.com/
To receive pointers by email, or to edit
or delete a current email address, go
to
https://www.servicebench.com/
Amana, Jenn-Air, KitchenAid, May
And Whirlpool Refrigerators.
Models:
See attached pages.
Serial Numbers: All
Concern:
Ice build up on bottom of freezer.
Defrost water does not drain.
Duck bill check valve plugged.
Correction:
A “P Trap†drain tube kit is now available for the
models listed on the attached sheets. If the new
design “P Trapâ€, see figure 1, has not already been
installed, Order and install kit part number
W10619951. Follow the detailed instructions supplied
with the kit.