As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LEAVING REVERSE NR 1 ENGINE BACK-FIRED AND CAUGHT FIRE THEN QUICKLY WENT OUT. REPLACED NR 1 ENGINE ASSY DUE TO FAILED NR 8 CYLINDER AND NR 13 CYLINDER EXHAUST TAPPET STUCK OPEN. ENGINE CHANGED IAW EAC DC-6MM 5.16, GROUND RUN CHECKS GOOD.