As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MX PRE-FLIGHT INSPECTION, TECH NOTICED THAT UPPER AFT DOOR ALIGNMENT SPIGOT WAS CRACKED AROUND THE FULL CIRCUMFERENCE OF THE BASE. THE SPIGOT BROKE COMPLETELY OFF WITH A VERY LIGHT TOUCH. IT IS SPECULATED THAT SPIGOT MAY HAVE AT ONE TIME BEEN HIT TO CAUSE CRACK AND THEN SUBSEQUENT DOOR CLOSINGS PROPAGATED THE CRACK AS SPIGOT PENETRATED DOOR ALIGNMENT CHANNEL.