As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - ON CLIMB BOTH ENGINE FLUX 3. FLUX WAS INDEPENDENT FOR EACH ENGINE. WHEN POWER PULLED OUT OF DETENT FLUX 1-2 PERCENT OF SET POWER. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. REPLACED BOTH ENG NR 1 AND NR 2 PRECOOLER FILTERS IAW AMM TASK 36-11-31-000-802 AND 36-11-31-400-802. NO FURTHER DEFECTS NOTED. RETURNED TO SERVICE.