As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE "ENTRY DOOR" CAS ILLUMINATED DURING FLIGHT. TROUBLESHOOTING FOUND ONE DOOR SWITCH OUT OF ADJUSTMENT, THE SWITCH WAS ADJUSTED, THE DOOR WARNING SYSTEM WAS FUNCTIONAL TESTED AND FAILED. THE S153 MAIN CABIN DOOR SWITCH WAS FOUND TO BE DEFECTIVE. A NEW DOOR SWITCH WAS INSTALLED P/N 311SM7-T. FUNCTIONAL CHECKS WERE SATISFACTORY. REF: LEARJET 45 AMM 52-70-01.