Eric O Long Beach , CA February 15, 2015 Appliance: Samsung Refrigerator RS2577BB/XAA Samsung Refrigerator Rs2577bb/Xaa / : Fridge side was warming up due to coils not defrosting properly freezer was fine. How to replace Water Tank Heater. Replaced 4 different parts based on reviews here and various other sources. 4 parts included: 1) Sensor - AP4136950 (DA32-10109Y) 2) Temperature Sensor - AP4136842 (DA32-00006W) 3) Temperature Sensor - AP4136048 (DA47-00095E) 4) Drain Heater - AP4136045 (DA47-00094C) Replaced #1 and #2 first, but didn't correct the problem. So far (1 week), replacing #3 and #4 appears to be working. Be careful, it seems the reviews on this site are applied to multiple products, so it may not be clear which product pertains to the fix noted in each review. Other than this confusion, site is great and price is right. 4 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes