As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, FLIGHT CREW REPORTED SMOKE IN COCKPIT AND CABIN. DECLARED AN EMERGENCY AND RETURNED TO DEN WITHOUT INCIDENT. MAINTENANCE REPLACED NR 1 ENGINE. AN ADDENDUM WILL BE ISSUED WHEN CAUSE OF FAILURE IS KNOW. ADDENDUM: PERFORMED BORESCOPE INSPECTION, PERFORMANCE RUN AND ACCOMPLISHED AN ENGINE WASH. NO DAMAGE OR DEFECTS WERE FOUND.