As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE IDLED 12 PERCENT HIGHER THAN LEFT AT IDLE POWER DURING DESCENT (36-48 PERCENT). ENGINES SURGED AFTER AUTOTHROTTLE DISCONNECT. MAINTENANCE REPLACED THE NR 2 ENGINE FUEL FILTER IAW 73-12-42. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK. AIRCRAFT WAS GROUNDED.