As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTS SMOKE IN COCKPIT. UNABLE TO DUPLICATE ON GROUND. PERFORMED TEST OF RT AND LT RECIRCULATION FANS, OPS CHECKED EQUIPMENT COOLING FANS, RAN APU WITH AI ON, TRIED DIFFERENT CROSSBLEED CONFIGS, NO ODOR EVER NOTED. THIS ISSUE NEVER APPEARED AGAIN AFTER 1/16/08.