As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE COMING OUT OF APU EXHAUST REPORTED BY RAMP. SHUT DOWN APU, SMALL FIRE STILL BURNING AT EXHAUST CONE, APPEARED WET WITH OIL. DISCHARGED DRY CHEMICAL EXTINGUISHER DOWN TAILPIPE. MAT REPORTS HIGH EGT WITH APU RUNNING. LOOKED IN TAIL PIPE. T WHEEL TORN UP. REPLACED APU. CLEANED TAIL PIPE IAW MM.