As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 401 - BOS-MSY - FAINT MISTY SMELL (BORDERING ON FUMES) DURING CLIMBOUT AROUND 26000FT. LASTED ONLY MOMENTARILY. F/A'S THOUGHT MAY HAVE BEEN LOCALIZED AROUND SEAT 2CD AREA. FAINT SMELL RETURNED FROM 12K-6K ON DESCENT THEN CLEARED AGAIN. ACCOMPLISHED FIM TASK 21-20-00-810-801A FOR ABNORMAL SMELL IN CABIN. ORIGIN OF SMELL SUSPECTED FROM LTV SEAT 1CD. ACCOMPLISHED T/S IAW E190 FIM 21-20-000810-801-A AND LTV MM 44-20-10, NO FAULTS FOUND. REMOVED AND REPLACED 1CD AND 2CD XEB'S AS PRECAUTIONARY IAW LTV MM 44-20-10, SYS OPS CHECKS GOOD.