As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - AFTER TAKEOFF LEFT ENGINE COMPRESSOR STALLED AT APPROXIMATELY 2000 FEET ABOVE GROUND LEVEL AT CLIMB POWER. ENGINE POWER REDUCED AND STALL CLEARED. NO OTHER INDICATIONS. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. REPLACED LEFT HAND ENGINE FIRST STAGE FAN BLADES PER MCM WORK CARD 72-91-11. REPLACED LEFT HAND ENGINE PRESSURIZING AND DRAIN VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION.