Amana fridge BM20TBW frost

Hello: I have a bottom freezer Amana model BM20TBW fridge with a frost problem in the freezer. Frost is building up near the front of the icemaker in the corner. Sometimes, maybe once a week, there is a very small puddle of water at the bottom of the freezer door. I assume defrost cycle is not working? Can you troubleshoot this with a DMM (continuity of switch, motor, etc)? Also, where is the defrost motor? Thanks for any help, Bill
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Competent help and parts are available at repairclinic.com/ Give them a try. Good luck.
joe
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