As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT AFT CABIN DOOR SLIDING WINDOW WAS FOUND TO BE MISSING AT SHIFT CHANGE WALK AROUND BY PILOTS. LOCATION AND TIME OF WINDOW DEPARTING THE ACFT IS UNKOWN. CREW DID NOT NOTE THE WINDOW MISSING DURING ANY FLIGHTS. REPLACED WINDOW AND PUT ACFT BACK IN SERVICE.