Hi neg for what you say is a matter of cleanliness since in 20 years it never brought problems, it may be uneven to the side and maybe that's how they told you, but the important thing is that it is tilted back. It can happen if the water is dripping in that the passage of water from the front where the evaporator is clogged by dry land and lint and on the other hand it is quite dirty of dry land in general throughout the interior and plugged its exit that It has a little hole behind everything on the outside side. Between two they can take it out and that yes, surely making a little strength and moving it back and forth. Watch out for the aluminum slabs that the condenser and evaporator have do not crush look well where they rest their hands to push from outside to inside. Take out the front first and see if you do not have any screws that hold the chassis to its wall-mounted housing. Be careful to pour water on compressor and ignition keys or platelet if you had, the rest does not affect you greetings