As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD HUM FROM OVERWING EXIT BY SEATS 12A & C DURING CLIMB. NOISE WENT AWAY AFTER REACHING CRUISE ALTITUED FL350. PRESSURIZATION WAS NORMAL ALL DOOR INDICATIONS NORMAL. REMOVED LT FWD OVERWING EXIT HATCH, CLEANED SEAL, REINSTALLED HATCH. LEAK CK GOOD IAW AMM 52-21-11 PB401 AND AMM 05-53-00-780-001-A. OK FOR SERVICE.