As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COKING ON INJECTION MANIFOLD LABRYNITH SEAL TO INJECTION WHEEL. CAUSED NG SECTION LOCK UP AFTER SHUTDOWN, PRIOR TO START UP. FUEL SAMPLES AND DELIVERY SYSTEM UNDER INSPECTION AND PARTS SENT FOR EVALUATION. THIS PROBLEM ISOLATED TO AIRCRAFT OPERATIONS. (K)