What was found
DEN - FLT 366 - NR 1 ENGINE AIR VALVE STUCK OPEN AT ALTITUDE. CLEANED POPPET VALVE - NO FIX, REPLACED THE VALVE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DEN - FLT 366 - NR 1 ENGINE AIR VALVE STUCK OPEN AT ALTITUDE. CLEANED POPPET VALVE - NO FIX, REPLACED THE VALVE.