As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR INTERRUPT, NO EMER DECLARED. LANDING UNEVENTFUL & ACFT WAS NOT OVERWEIGHT. LOUD SQUEAL DURING TAKEOFF ROLL FROM FLIGHT DECK WINDOW. PRESSURIZATION CONTROLLER INDICATED AUTO FAIL & GREEN ALTERNATE LIGHT ON. FLIGHT RETURNED. REPLACED NR 2 APC IAW AMM 21-31-01. SYS CHECKED NORMAL.