As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MUSTY AND OILY ODOR IN AC SYSTEM DURING ENTIRE FLIGHT WITH OCCASIONAL FLUCTS IN AIR FLOW CORRECTIVE ACTION: DESERVICED THE APU TO THE PROPER LEVEL AND REMOVED AND REPLACED THE COALESCER SOCK. PERFORMED MULTIPLE OPERATIONAL CHECKS AND LEAK CHECKS OF THE APU AND ESC SYSTEMS. NO LEAKS, OR OTHER DISCREPANCIES ARE NOTED AT THIS TIME. WORK PERFORMED IAW AMM 12-11-03 & 21-51-00.