As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) 1.3 MINUTES INTO TAXI #2 JANITROL WAS LIT, FIRE INDICATION ON JANITROL. JANITROL SHUT DOWN EXTINGUISHER ACTIVATED. FIRE CONTAINED IN THE JANITROL. THE VENT BLOWER HAD FAILED AND THE VENT BLOWER PRESSURE SWITCH DID NOT ACTIVATE THE SAFETY CIRCUIT TO SHUT DOWN THE FUEL SOLENOID AND IGNITION UNIT. THE SAFETY CIRCUIT WAS OPERATING PROPERLY.