As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR PUMP WILL NOT SUSTAIN REQUIRED PRESSURE WHEN ENGINE BECOMES HOT. UPON TROUBLESHOOTING THE MECHANIC NOTICED ON INITIAL RUN UP PRESSURES WERE WITHIN LIMITS, AFTER ENGINE STARTED TO WARM UP THE PRESSURE STARTED TO DROP BELOW LIMITS. REPLACED AIR PUMP WITH A NEW UNIT. PERFORMED AN OPS CHECK AND FOUND TO BE NORMAL. NO PROBABLE CAUSE OR RECOMMENDATIONS AT THIS TIME.