What was found
THE MAIN CABIN DOOR "OPEN" CAUTION MSG ON EICAS WITH THE DOOR CLOSED DURING TAXI. CREW RETURNED A/C BACK TO THE GATE. MAINTENANCE THEN DEFERRED THE MAIN CABIN DOOR WARNING SYSTEM PER MEL 52-70-00-1, CAT B AND OPS CHECKED GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
THE MAIN CABIN DOOR "OPEN" CAUTION MSG ON EICAS WITH THE DOOR CLOSED DURING TAXI. CREW RETURNED A/C BACK TO THE GATE. MAINTENANCE THEN DEFERRED THE MAIN CABIN DOOR WARNING SYSTEM PER MEL 52-70-00-1, CAT B AND OPS CHECKED GOOD.