I have a jennair refrigerator model JRTD229 water is dripping from bottom of freezer (my refrigerator ceiling) I think the defrost drain may be plugged. Where is it located and how do I access? Thanks

You need to clean it. Unplug the unit and remove the cover to the freezer coils. At the bottom of the coils there is a drain pan which gets stopped up with food and other things like dirt, meat juice, etc. Wash it out well with Windex and a water hose nozzle to unstop it. Be careful not to bend any coils or Freon (refrigerant) lines. Then remove the back and spray down coils and fan blades with soap and wash them off with water hose nozzle. It does not take much water, but it's the only way to clean coils and get grease and dirt off them so that they transfer heat well again. Just vacuuming off does not work nearly as well and you have to clean the fan because just a 1/16" of dirt on edges of blades kills 30% of airflow. Pull out drain pan and clean with bleach and soap if it comes out, or clean it and vacuum out with wet-vac. It's very important to keep the coils clean or the dirt will cause the compressor to burn up.