As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT CABIN DOOR MONITOR CIRCUIT BREAKER TRIPPED. DID NOT ATTEMPT RESET. RETURNED TO RAMP. HEAVY ELEC FIRE SMOKE FILLED COCKPIT. R & R AN INOPERATIVE CABIN DOOR PCB, IAW AMM 24-51-02. OPS CHECKED GOOD IAW MM 52-70-00-710. R & R THE VENT DOOR SOLENOID IAW MM 52-10-00. OPS CHECKED GOOD.