I have a need to know, In the next few days I am going to replace an Evaporator Coil in a Bard unit Model#WL423A05XWXXXJ Serlal#253K041945367-02 My question before I attempt doing this job, Do you have too remove the unit off of the wall and replace the coil? I have been told you have to do this to replace the coil, looking at this unit it looks to me you can replace the Evaorator coil in place? I hope this is the answer, and I don't have to take this unit off of the building!!!!!!