As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:NAON DECENT BETWEEN FL260- FL190, DISTINCT SPINNING ROTATIONAL SOUND FROM BELOW FLIGHT DECK FOLLOWED BY DISTINCT NON-CAUSTIC SMELL. AS SOON AS SOUND STOPPED SMELL DISAIPPATED QUICKLY. NO SMOKE/NO ALERTS/ NO CREW ACTION OTHER THAN EXPEDITED LFOUND NUMBER 2 AVIONIC RACK FAN BREAKER POPPED. R/R NUMBER 2 FAN PER AMM 21-26-02. OP CKS GOOD.