As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE LEFT PACK LIGHT ILLUMINATED WITH REPORTS OF SMOKE IN THE COCKPIT. AIRCRAFT RETURNED TO DEPARTURE. MAINTENANCE RAN LEFT ENGINE FOR 30 MINUTES. NO LEAKS OR ODORS DETECTED. FOUND LEFT RAM AIR MOD BREAKER OPEN. RESET SAME. WIRING CHECKED GOOD. RAM AIR ACTUATOR INOPERATIVE. MAINTENANCE REPLACED THE LEFT PACK RAM AIR DOOR ACTUATOR IAW AMM 21-51.