What was found
FLT 1833, BOS-SFO. STRONG MUSTY ODOR UPON TAKEOFF ODOR ISOLATION DISTINGUISHED PACK 1 ODOR IMPROVED WITH PACK 1 OFF YET DID NOT COMPLETELY GO AWAY 2 FLT ATTENDANTS HAD MILD IRRITATION AIRWAY LEVEL 2 EVENT.ODOR RETURNED ON DESCENT AND CABIN WITH PACK 1 OFF APU OFF NOT AS STRONG BUT DEFINITE MUSTY SMELL. ; CW INFO NOTICE 2017-T015M AND PERFORMED A LEVEL 2 ACS DECONTAMINATION. IDENTIFIED ODOR COMING FROM PACK 1 DECONTAMINATION LEVEL 2 WAS ACCOMPLISHED PER AMM 21-00-00-615-803-A PACK 1 AND APU DEFERRED ON LOGPAGE 4556640 ITEM 1 AND 2.REFERENCE LOGPAGE 4556637 ITEN 1 PACK 1 AND APU DEFERRED ON LP 4556640 ITEM 1 AND 2. ITEM PLACED ON MEL 49-10-01B CAT C MCC ROLAND NOTIFIED, DISPATCH NOTIFIED, MX-4 UPDATED, PLACARD INSTALLED, ACT FUEL TRANSFER TO CENTER TANK ACCOMPLISHED PER MEL 49-10-01B. OPEN