As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 15,000 FT EXPERIENCED LARGE ENGINE FLUCTUATIONS (TORQUE DROPS OF 25 TO 45 PERCENT) POWER WAS REDUCED, RETURNED TO THE MFR APT. EECS DEF. CLEANED EEC CANNON PLUGS. OHMED EEC SYSTEM AND RAN EXTENSIVE GROUND CHECKS OF ALL PARAMETERS AND COULD NOT DUPLICATE. OPS CHECKS GOOD.