As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTICED MUSTY DRY ODOR APU BLEED OPERATION ON THE GROUND WITH ENGINES OFF. CABIN ODOR REPORT SHEET WAS SUBMITTED TO MCC - CORRECTIVE ACTION: REFERANCE LP 210021 ITEM 2PERFORMED TSM INSPECTION 05-50-00-810-831-A. FOUND TO BE APU LEVEL A/C/W APU INSPECTION AMM 49-00-00-200-812. NO DEFECTS NOTED. PLACED ON MEL 49-10-01A C/N#1180435 DUE DATE3/17/2022. MX PRODEDURES C/W.PLACARDS INSTALLED W/MCC DR 434470