As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CAPTAIN SIDE WINDOW HAS A LOUD HIGH PITCH SQUEAL FROM TAKEOFF THROUGH CRUISE SEGMENT,DISSIPATES ON DESCENT. CABIN PRESSURE NORMAL REPLACED #2 LEFT SIDE FLIGHT DECK WINDOW AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER TASK CARD 08L21056001.