OK. This fixed my A120LE from leaking. First unplug the machine for safety. If you are looking at the back of the unit you need to take off the right side panel. I took off the all the panels but you could just take off the right side.

There is a reservoir on the top that collects condensation from the top coil. (shown in the circle) The drain hole on mine was clogged. If you stick a small screwdriver or paperclip in the hole to push the debris through it should start working properly again. I did this to mine yesterday and it hasn't leaked since!! Drain hole is shown here in close up picture. Unclogging this will allow the condensation to flow down to the main reservoir on the bottom where it will be evaporated in the AC exhaust.


Good luck!