As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ONCE AT FLIGHT IDLE ON THE DESCENT THROUGH 17000 ABNORMAL ODOR NOTICED IN FLIGHT DECK. NOTHING NOTED IN CABIN. COMPLIED WITH QRH15-38, AND ODOR DISSIPATED WITHIN SEVERAL MINUTES. TURNED PACK1 AND CROSS BLEED BACK TO AUTO AND ODOR CAME BACK. COMPLETED FLIGHT WITH PACK 1 OFF AND CROSS BLEED SHUT AND NO FURTHER ORDOR NOTICED.