As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - ON FLIGHT NUMBER 2006, AFTER GROUND FAN WAS SHUT OFF, THERE WAS A POTENT ACRID BURNING ODOR. ODOR DISSIPATED BUT FAN WILL NOT WORK. REMOVED AND REPLACED GROUND AIR FAN. INSTALLED NEW FUSE IN DC CONTACTOR BOX. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.