As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORT LT TRIM AIR PRESSURE FLUCTUATING, POOR AIR QUALITY, AND TEMP CTL DIFFICULT. SELECTED THE LT TRIM AIR SWITCH TO OFF IAW FLT MAN AS A PRECAUTION. SAMC TEXT: CREW REPORT AIR HAD AN OZONE TYPE ODOR, IMPROVED WITH TRIM AIR SWITCH OFF. ACP FIM 21-51 T803. REPLACED FLOW SENSOR IAW MM, OPS OK.