What was found
LOUD HUM OR SQUEAL OVERHEAD IN AFT ROWS AND LT AND RIGHT NR 2 DOORS. ONLY OCCURS BELOW 10,000 FT. INSPECTED DOOR SEALS, WI- FI ANTENNA POD SEALS, AFT VHF ANTENNA SEAL, OUTFLOW VALVE OPERATION. NO DAMAGE NOTED TO SEALS. OUTFLOW OPS NORMAL. PERFORMED GENERAL VISUAL INSPECTION OF GALLEY AREA AND OUTSIDE OF ACFT. NO ABNORMALITIES NOTED.