As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APU START, RAMP AGENT INDICATED AN EXPLOSION AND MASSIVE OIL LEAKING OUT OF APU COMPARTMENT AFTER. MAINTENANCE INSPECTED AND FOUND APU CASE DAMAGED WITH NO EVIDENCE OF COMPARTMENT STRUCTURAL DAMAGE NOR PNEUMATIC SYSTEM DAMAGE OR CONTAMINATION. THE APU WAS REMOVED AND REPLACED.