As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 776, MSY-JFK. RETURNED TO FIELD. UNABLE TO PRESSURIZE THE CABIN. AIRMAN REPORTS A FAILURE OF THE AVIONICS SKIN AIR VALVE. VENT SKIN VALVE FAULT (SKIN AIR OUTLET VALVE); AEVC TEST SHOWS CHECK AEVC SUPPLY. FOUND DITCH S.W PIN C2 NOT SECURED IN SOCKET. PUSHED & SECURED 13HL DITCH S.W. PIN C2 IAW ESPM20-45-11 OPS CK GOOD IAW AMM21-26-00 MX-4 UPDATED & PLACARD REMOVED MCC NOTIFIED MDDR#388948 CLEARED.