As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE TAXIING TO MAINTENANCE AFTER A FUEL HEATER REPLACEMENT THE NR1 ENGINE CAUGHT FIRE. THE FIRE BOTTLES WERE DISCHARGED AND THE ENGINE SHUTDOWN. A PLUG WAS MISSING FROM THE NEWLY INSTALLED FUEL HEATER. INVESTIGATION BEING CARRIED OUT BY MANUFACTURER AND OPERATOR. TSB HAS BEEN ADVISED.