As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FA REPORTS "MUSTY SMELL" FROM CABIN AT 4000', WENT AWAY 3 MINS LATER. WAS NOT ABLE TO TROUBLESHOOT IN TIME BEFORE DISIPATING. PERFORMED ENG RUN OF NR 1 & 2 ENGS IAW AMM 71-00-00 NO ODOR DETECTED AT THIS TIME INSPECTED CABIN IAW TSM 71-00-00-810-847-A NO ODORS FOUND IN CABIN OR COCKPIT AT THIS TIME.