As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, LT ENG POWER FLUCTUATED & ROLLED BACK UP TO 10 PERCENT, THEN RECOVERED. FLUCTUATIONS CEASED UPON LEVEL OFF AT CRUISING ALTITUDE. ON LANDING NOTED MULTIPLE ERROR CODES IN THE SYS. TROUBLE SHOT THE SYS & FOUND THE CVG VLV DEFECTIVE. THE UNIT WAS REPLACED.