As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF AT ROTATION, "CABIN DOOR" LIGHT CAME ON. ONCE ON THE GROUND WITH THE DOOR OPEN, LIGHT FLICKERED ON AND OFF SEVERAL TIMES. GAINED ACCESS TO THE CABIN DOOR SWITCH. INSPECTED CONDITION AND WIRING FOUND SATISFACTORY; ADJUSTED SWITCH AND TIGHTENED AS REQUIRED. OPS CHECKED SATISFACTOR IAW CE-560 MM CHAPTER 20-00-00.