As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABNORMAL NOISE & VIB IN FLT DECK. FOUND DEBRIS IN CENTER DIST DUCTING. DUCTING HAS BEEN CLEANED FROM ROW 40 FWD TO ROW 30. NEED TO COMPLETE DUCT CLEANING FROM ROW 30 FWD. REMOVED LARGE DEBRIS ITEMS, FROM FLT DECK MAIN DIST DUCT AT TEMP BULB (WITH HOLE MULTIFOLD PAPER TOWEL, AND FLT DECK LEFT AFT EYEBALL DOWNSTREAM OF OVERHEAD Y DUCT. NOISE DB OK PER SVC TIP.