What was found
AIR TURNBACK/ DECLARED EMERGENCY. COMPRESSOR STALL ON NR 1 ENGINE AFTER TAKEOFF AT 4000FT. REMOVED AND REPLACED NR 1 ENGINE PER MM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIR TURNBACK/ DECLARED EMERGENCY. COMPRESSOR STALL ON NR 1 ENGINE AFTER TAKEOFF AT 4000FT. REMOVED AND REPLACED NR 1 ENGINE PER MM.