What was found
PDX - STRONG ACRID SMELL NOTICED FROM THE VENTILATION SYSTEM. REPLACED THE P2.5/P3 SWITCHING VALVE. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PDX - STRONG ACRID SMELL NOTICED FROM THE VENTILATION SYSTEM. REPLACED THE P2.5/P3 SWITCHING VALVE. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.