As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT AND LEVEL OFF THE EGT ON NR 4 ENGINE WAS CONTROLLED TO MAX CONTINUOUS POWER WITH N1 7 PERCENT LOWER THAN OTHER ENGINES INDICATIONS WERE IDENTICAL WHEN FADEC WAS TURNED OFF. N2 WAS ALSO SHOWING 3 PERCENT HIGHER. AIR RETURN TO MSP. MAINTENANCE REMOVED AND REPLACED NR 4 ENGINE BLEED BAND P/N 2-161-182-18, S/N ON 03246371277, P/N OFF 2-161-182-01, S/N OFF & UNKNOWN.