As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - POWERPLANT MESSAGES ON CLIMB-OUT ALL INDICATIONS NORMAL. RETURNED TO FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. REPLACED DIODE 3442-CR4, REF WM 32-61-01 SHEET 11. PERFORMED POWER ASSURANCE CHECK ON BOTH ENGINES PER MTC NR 670005, ALL CHECKS GOOD, NO " POWERPLANT" MESSAGES AFTER RUNS. RETURNED TO SERVICE.