As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MASTER WARNING PARTIAL TONE AND DISCRETE WARNING LIGHT INTERMITTENTLEY FLASHING ON AND OFF VERIFIED TO BE MCD DOOR IND. DEFERRED IAW MEL 52-30-3-4 MAINT PROC C/W (DEFERRED MDC DOOR INDICATION) PLACARD INSTALLED. REINSPECT BEFORE EACH FLIGHT. A/C RETURNED TO SERVICE.