As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN DOOR NEEDS ADJUSTING. THE DOOR LOWERS VERY QUICKLY WITH VERY LITTLE COUNTERBALANCE WEIGHT HOLDING DOOR IN THE CLOSED POSITION. THE CONDITION MAY HAVE CAUSED UPPER STEP PANEL TO COME OFF. CORRECTIVE ACTION: GAINED ACCESS TO MAIN CABIN DOOR SPRING AND CABLES FOUND SATISFACTORY, ADJUSTED CABLES AS REQUIRED. OPERATIONS CHECKED SATISFACTORY IAW CESSNA CE-680 M/M CHAPTER 52-10-00.