As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU OIL MONITORING DATA SHOWS OIL CONSUMPTION TO BE TRENDING HIGHER THAN EXPECTED. GROUNDED - YES. REINSPECTED APU AREA FOLLOWING STEPS 1-4. NO HARD FAULTS FOUND. REMOVED AND REPLACED APU OIL COOLER REF AMM 49-91-41. PERFORMED OPS/LEAK CHECK. NO LEAKS NOTED.