What was found
ATB- RETURNED TO MSP DUE TO LEFT ENGINE SURGING. REDUCED THRUST AND SURGING STOPPED. REPLACED LEFT ENGINE. OPS CHECK NORMAL. (8225854).
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ATB- RETURNED TO MSP DUE TO LEFT ENGINE SURGING. REDUCED THRUST AND SURGING STOPPED. REPLACED LEFT ENGINE. OPS CHECK NORMAL. (8225854).