As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DOOR HANDLE PLACED IN THE OPEN POSITION, BUT LOCKING PINS WILL NOT RELEASE. DOOR CAN NOT BE OPENED. UNLOCKED CABIN DOOR AND OPENED AS NORMAL. NOTED WATER AROUND THE DOOR SEAL AND VENT DUE TO HEAVY RAIN THE PRIOR DAY. IT IS SUSPECTED THAT THE DOOR FROZE. NOTE: DOOR PINS ARE WELL LUBED. OPS CHECKED GOOD IAW 52-10-20-801A