As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT, A LOUDER THAN NORMAL WIND NOISE WAS HEARD ON THE RIGHT SIDE OF THE COCKPIT. THE CABIN ALTITUDE CLIMBED AS HIGH AS 11500'. THE CABIN ALT LIGHT CAME ON AND THE HORN SOUNDED. KNOB PULLED MASKS DROPPED. ITEM IS UNDER INVESTIGATION.