As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 9535 STARTED APU AND DIRTY, MUSTY SMELL OCCURRED ONCE AIR CAME ON. CALLED MX, UNABLE TO FIX IMEDIATLY. CORRECTIVE ACTION: COALESCER BAGS SOAK IN WATER AND DIRTY CAUSE THE ODOR IN CABIN. FOUND DRAIN LINE CLOGGED AND UNCLOGGED LINE. RAN APU FOR 2 HOURS WITH NO SMELL. (7399952)