As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A PORTION OF THE COPILOT SIDE WINDOW DEPARTED THE AIRCRAFT DURING CLIMB AT 15,000 FT. AIRCRAFT RETURNED TO DEPARTURE AIRPORT. UPON INSPECTION, THE AIRFRAME STRUCTURE AND WINDOW FLANGE WERE NOT DAMAGED. THE REMNANTS OF THE EXISTING WINDOW WERE REMOVED, AND A NEW WINDOW WAS INSTALLED IN ACCORDANCE WITH THE MANUFACTURERS MAINTENANCE MANUAL.