As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FA'S REPORTED A PUNGENT ODOR ON RECENT THROUGH APPROACH. ODOR WENT AWAY WHEN WE LANDED FA'S SAY IT WAS LEVEL 1 SEVERITY LEVEL. FWD CABIN, A FLIGHT ATTENDANT MID CABIN AND AFT. NO SMELL IN COCKPIT. GROUNDED - YES. REMOVED AND REPLACED AIR RE-CIRCULATION HEPA FILTER REF. AMM 21-25-01 AND THE WATER COALESCER BAG REF. AMM 21-51-05. OPS CHECK AND LEAK GOOD. NO UNUSUAL ODOR PRESENT.