Far fetched speculations
..Just for the record. VERY unlikely theoretical reason
why the flaps might have been found in the "up" position.
1. They got retracted at touchdown e.g. got accidentally hit by the F/O
on hard impact.
2. Flap/slat only got deployed one ONE WING.. .
This might explain the wing drop and significant right turn.
Also this might explain a no config warning situation... .
XPM