As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. L2 DOOR WILL NOT SHOW ARMED WHEN ARMING HANDLE IS IN THE ARMED POSITION. REMOVED INSULATION FROM L2 DOOR THAT WAS INSTALLED OVER TOP OF ARMING HANDLE STOP WHICH PREVENTED HANDLE FROM MAKING CONTACT WITH STOP. OPERATIONS CHECKS GOOD, PER AMM 52-11-22.