As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE, NUMBER 4 ENGINE WOULD NOT ACCELERATE; ACCOMPLISHED QRH PROCEDURE: ABNORMAL ENGINE RESPONSE TO THROTTLE SETTING. ACCOMPLISHED PNEUMATIC MANIFOLD INSPECTION OF NUMBER 4 ENGINE. ALL CHECKS NORMAL PER AMM 36-11-01. ITEM TRANSFERRED TO DI 21818 PER MEL 36-5-01, CAT C (PYLON VALVE INOP).