As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE AIRCRAFT WAS POSITIONED AT GATE, FLIGHT-CREW STARTED THE APU AND IDENTIFIED WHAT SOUNDED LIKE A BANG. APU FAULT MESSAGES APPEARED, AND RAMP CREW REPORTED APU CONTENTS FOUND ON THE GROUND. PARTS OF APU SHOT OUT FROM APU APPROXIMATELY 20METRES FROM THE TAIL. RESOLUTION APU REPLACED IAW T/C 7-49-999-00-02, LEAK CHECK CARRIED OUT (TC# 20190401007)