As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS CONSTANT SQUEAL FROM COCKPIT WINDOW DURING CLIMB, CRUISE, AND DESCENT. SQUEAL STOPPED DURING DESCENT AT 5.0 DIFFERENTIAL AND 16,500 FT. MAINTENANCE PERFORMED PRESSURIZATION SYSTEM MANUAL MODE TEST IAW AMM 21-31-00. COULD NOT DUPLICATE SQUEAL NO LEAKS NOTED AT THIS TIME.