As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POWER REDUCTION AT FL210, THE NR 1 ENGINE EXPERIENCED A COMPRESSOR STALL. AS EGT CLIMBED TO 750 DEGREES, THE ENGINE WAS SHUT DOWN AND RESTARTED. CREW FOLLOWED COCKPIT OPERATING PROCEDURE AND CONTINUED FLIGHT TO PHL WITHOUT FURTHER INCIDENT. VISUAL AND TYPE-A INSPECTION REVEALED NO DISCREPANCIES. BORESCOPE INSPECTION WILL BE DONE WITHIN FOUR CYCLES.