As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT RECIRCULATION FAN EXTREMELY LOUD. TOO LOUD FOR USE IN FLIGHT. RT RECIRCULATION FAN INOP. 4SS FOR DUCT CLEANING. CHECK DB NOISE LEVEL WITH APU ONLY, DUCT PRESS 14PSI BASE LEVEL,105-DB LT RECIRC FAN ON RT OFF 107DB, LT FAN OFF RT FAN ON 109 DB.ACCOMPLISHED DUCT CLEAN OF ENTIRE CABIN. DB NOW 73 WITH FAN OFF AND 75 WITH FAN ON.