As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - AT FLIGHT LEVEL 330, RAPID INCREASE IN ELECTRICAL BURNING SMELL FOLLOW WITH A HAZE IN THE CABIN. RIGHT CABIN AIR RECIRC FAN CIRCUIT BREAKER POPPED. SMELL AND HAZE DISSIPATED RAPIDLY ON DESCENT. REMOVED AND REPLACED RIGHT RECIRC FAN, OPS CHECKED NORMAL. (M)