As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THE CABIN DOOR WOULD NOT LATCH. INSPECTION OF THE DOOR FOUND THE CABIN DOOR STRUCTURE U-CHANNEL NEAR THE HINGE WAS CRACKED. REPLACED THE U-CHANNEL, Z-CHANNEL, AND HINGE. DOOR MAY HAVE BEEN OVERSTRESSED BY MORE THAN ONE PERSON ON DOOR AT A TIME. SUBMITTER SUGGESTS PLACARD DOOR FOR ENTRANCE BY ONE PERSON ON STEP AT A TIME, AND USING A SUPPORT FOR THE DOOR WHEN POSSIBLE, ESPECIALLY WHEN IN FOR MAINTENANCE.