As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 2433, DCA-DJT. LEVEL 1 ODOR NOTICED ON FLIGHT DECK DURING IDLE DESCENT AT FL250 IN IMC. DISSIPATED AFTER PACK 1 WAS TURNED OFF. COMPLIED WITH INFORMATION NOTICE 2017-T015 STEPS 1 + 2. IDENTIFIED ODOR TYPE 1. DECONTAMINATION LEVEL B ACCOMPLISHED PER AMM 21-00-00-615-002A. AIRCRAFT IS OK FOR SERVICE (BOTH RECIRC FILTERS REPLACED)