As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/A REPORTS MSTY SMELL IN REAR AT A/C MOVING FORWARD. STARTED IN DECENT AROUND 12,000.-PERFORMED TSM 05-50-00-810-831. PERFORMED DECONTAMINATION OF ECS SYSTEM IAW AMM 21-00-00. NO ORDER NOTED AT THIS TIME. CHECKED APU FOR OIL LEAK. NO LEAKS NOTED. NO LEAKS NOTED ON ENGINE 1 OR ENGINE 2.