[ree]

First time for me too was left only. The time today was both.

I just took a look in the service manuals. Perhaps I'm not looking in the right place, but all the HVAC door replacement procedures (Recirculation, Mode Upper, Mode Lower, Air Temp Door Left and Air Temp Door Right) start with "Remove the HVAC module assembly" which starts with "Drain the engine coolant" and a bunch of other stuff that doesn't look too simple.

I haven't yet searched the manual enough to see if there's a simpler procedure to get at the doors enough to inspect them. If I figure it out, I'll let you all know.

I really seems like a software/firmware bug though or maybe some sensors that indicate the orientation of the doors (wild speculation).