Hi,
Here is some my opinion ,For the Red colour section. At first, if they are specialist in aircond, once the the place was blocked up by your house design, they should comfirm with you whether those poor water flow in drainage pipe might effect in future. if for profesional aircondman, they will suggest u better solution if anything not correct. And regarding the condensation problem, i am suspecting the drainage line is at poor flowing and the insulation was using lower quality when installation, need to check just able to comfirm it.
2nd, about the power trip, i believe there is the connection between middle of those wires. The proper way they shall use 1 length wire but not connect two wire for thier saving propose. Due to your poor water flowing and cause leaking in middle trunking, water will stay inside and might effect the connection between wires and that will cause tripped in your house.
My final advise, since it still under warranty, call them back and fixed it completely for you. Hehe... if can find some expert to comfirm full view of your problems first, then only u able to talk with them... hehe....good luck....