As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNDEFINED SMOKE ODOR IN THE COCKPIT DURING LAST PORTION OF CLIMB TO 10,000 FEET. GRADUALLY WENT AWAY AFTER TEN MINUTES. UNABLE TO IDENTIFY OR ISOLATE SOURCE. FOUND AIR CONDITIONING DRIVE PULLEY WARPED AND CORRODED CAUSING DRIVE BELT TO BURN IN A SHORT PERIOD OF TIME. REPLACED JACK SHAFT AND PULLEY.