As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER A FLIGHT, THE PILOT COULD NOT OPEN THE CABIN DOOR AND HAD TO CLIMB OUT THE EMERGENCY WINDOW. THE DOOR COULD NOT BE OPENED FROM THE OUTSIDE EITHER. DISASSEMBLED THE DOOR, AS WELL, AND FOUND THE AFT LATCH PIN BELLCRANK BRACKET BROKEN WHICH CAUSED THE AFT DOOR LATCH PINS TO REMAIN EXTENDED. THE BRACKET HAD BEEN STRESSED BY LINKAGE ARM HITTING IT WHEN OPENED.