As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURE SQUEAL COMING FROM FWD GALLEY CHILLER DRAIN HOSE, BEHIND ACCESS PANEL (REMOVED) JUST BELOW FWD GALLEY CHILLER. SQUEAL STARTS WHEN HULL IS PRESSURIZED TO 5.2 DIFFERENTIAL PRESSURE. REPLACED 2 EACH HOSES BY GALLEY CHILLER DRAIN. PRESSURIZED CABIN UP TO 4.0. NO LEAKS NOTED.