As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU HAS A HISTORY OF OIL SERVICING AND BLUE MAINTENANCE LIGHT ILLUMINATING CURRENT OIL CONSUMPTION IS HIGHER THAN EXPECTED. GROUNDED - YES. FOUND BACK SIDE OF APU OIL COOLER COATED IN OIL. REMOVED AND REPLACED APU OIL COOLER REF AMM 49-91-41, LEAK CHECK GOOD.