Unplug fridge.
Remove refrigerator crisper drawers to access back panel vent.
Remove the plastic tube casing on the right side.
Remove 3 screws on the panel and carefully pull off-panel to the left and
be careful not to damage the styrofoam casing underneath, particularly around the condenser fan.
Disconnect the fan from the back
Remove 2 top screws from drain trough and remove from behind the coils.
Install the new drain trough.
Reverse steps to put everything back.
Confirm that the condenser fan is reconnected and working properly by pushing the door light button. The fan should kick on.