As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISPLAY COOL MESSAGE CAME ON CLIMBING THROUGH 12,000 FEET. TRIED FLT ALT AND STBY POSITIONS ON DISPLAY FAN. MESSAGE REMAINED FOR ABOUT 10 MINUTES. VERIFIED FAN OPERATION IN ALL POSITIONS AND AIR FLOW GOOD, NO LEAKS. REPLACED AIRFLOW SENSOR. OPS CHECK GOOD ON GROUND. P/N: 009519-04.