As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMALL LOWER PASSENGER DOOR WINDOW SEPARATED FROM FRAME AND DEPARTED THE AIRCRAFT. THE SMALL COMFORT WINDOW IS LARGER THEN THE OPENING AND IS INSTALLED FROM THE INSIDE. IT SHOULD NOT BE POSSIBLE TO COME LOSE TOWARD THE OUTSIDE OF THE AIRCRAFT. SUSPECT WRONG PART USED BY PREVIOUS OWNER. SIZE ISSUE WAS NOT EVIDENT DURING PERIODIC INSPECTIONS.