The freezer is overflowing with ice as if there was a leak. At times there was a yellow/brownish liquid that freezes on the door & the front of the drawers. The refrigerator seams to have an excess of water too. Do I need to defrost it? I can't find the manual & am not sure how. Please advise

is water supply ok? leak around freezer door, fix/replace freezer door gasket

Bad door seal resulting in condensation and water leakage. secondly a bad defrost terminator will cause a build up of ice in freezer

IF you are talking about a freezer, make sure the unit is level as the condensate pan may be overflowing. Also, if the door does not seal properly, it can cause "Sweating" as cold air is escaping and causing condensation at the door. Start with that first.

Sounds like the defrost drain is cloged. There is a hole at the bottom of the freezer behind the back wall. if this is cloged then the water that is suppost to drain there will overflow and freez.

I am uncertain as to what you mean by "when tray is full"? However, you probably have a clogged drain in the freezer compartment. During the defrost cycle, which usually occurs every eight hours, defrost components (defrost thermostat & heater(s) ) melt the ice that has accumulated on the evaporator coil in the freezer compartment. The water from the melted ice drains through a hole in the freezer compartment (behind the freezer's rear panel) and accumulates in a drain pan below the refrigerator. This water should evaporate over time, whereby you should not have to regularly empty the drain pan. If the drain hole is clogged (usually from algae or other debris, etc.), the water finds another path to flow (which is inside the bottom of your freezer compartment). This water will usually freeze. Water will then flow toward the front of your freezer compartment and out of the door on to the floor when you open the door.

Contact an appliance service company to unclog your freezer drain. Also have them check your defrost components (thermostat & heater(s)).

check seal all around bottom

I have run into this before and found it very helpful to re-level the refrigerator. By leaning the fridge back toward the wall about an inch helped keep the water and ice in the tray. Remember to remove items that block air flow in the freezer. Remove the ice bin and clean it then start over with the fridge leaning back a little. Hope this helps.

If the fill tube gets choked up with ice, it usually means that the water fill solenoid valve is leaking. The valve is not closing properly and is dribbling water. If the leakage is slow enough, water may freeze in the fill tube. Over time it will freeze the tube completely shut. or it could be that the ice maker is not level.

The ice trays bust be cleaned to prevent calcium build up. This will prevent the ice from froming in trays.
The overflow could be caused by the freezer not being level, or by the water fill timer not shutting of the incoming water. This will keep the water temp. too high to freeze the water. Also check the fill valve for sepage.

It sounds like the ice in the bin is warming up enough to melt for some reason then re-freeze. Check your door gasket seal and also the ice chute door flapper seal to make sure warm room air isn't being drawn into the ice bin area. Also make sure the freezer area is VERY cold like 0 degrees F or lower, that will keep the ice hard and help stop the ice from having a liquid surface film from opening and closing the freezer door too often (then freezing again). The water down the back is from the ice cubes melting a little then re-freezing. Also, is the frige working OK? Does the compressor turn on and off normally? I ask because sometimes the compress start device is failing and the refer can warm up quite a bit while the compressor is trying to start up... eventually the compressor will start but by then the ice has melted a little then the compressor runs for a long time to bring the temps down again. Monitoring with a thermometer every hour will show if the temps are lowering in the freezer section too much.