As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - FLT 31 - AT TOP OF CLIMB, NR 1 ENGINE ENCOUNTERED POWER SURGE. REDUCED POWER AND REAPPLIED POWER. FOUND ENGINE VANE BLEED CONTROL, MFG P/N 766555-7, MALFUNCTIONING. CHANGED ENGINE VANE BLEED CONTROL AND ENGINE OPERATION CHECKED NORMAL.