Had my 2nd "problem" since purchasing my '04 last year. The passenger light stopped working. Turns out the bulb came out of the holder, probably when we hit one of our winter potholes that are everywhere in my town. Popped the cover off and put the bulb back in the holder - everything is fine now.
My only other problem occurred at delivery. My car has the Navigation unit and the Bluetooth mic would not work. Dealership ordered a new head unit and replaced it within a couple of days. Good service, but a bit of a concern that fixing something small - like a mic - requires the whole navigation unit be replaced. They thought the mic could be replaced separately like on other cars, but after talking to Mitsubishi, found out that the whole unit needs to be swapped out due to the design.
New unit has functioned fine since installed.