As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXPERIENCED ENGINE SURGE ON NR 1 AND 2 ENGINE OF 8 TO 10 PERCENT TORQUE DURING CLIMBOUT,AFTER SELECTING NR 1 ENGINE BLEED OFF, ENGINE OPPS NORMAL, SURGE RETURNS IF NR 1 BLEED IS SELECTED ON. R & R BOTH NR 1 HIGH PRESSURE SWITCHES. REF DASH8 MM 21-11-21. OPS CK GOOD AT THIS TIME.