As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXCESSIVE WEAR TO THE THREE WHEELS, SLIDE, AND SUPPORT OF THE L/H UPPER CAR ASSEMBLY RESULTS IN CABIN DOOR NOT FUNCTIONING PROPERLY, COMING OFF TRACK, OR FALLING OFF AIRFRAME. THIS REPORT IS SUBMITTED TO SHOW THE SYSTEMIC FAILURE RATE AND UNRELIABILITY OF THE L/H UPPER CAR ASSEMBLY.