What was found
(CAN) AFTER B CHECK, DURING A FLIGHT, THERE WAS A PRESS AUTO FAULT MSG. THIS WAS RESET IAW THE FAULT ISOLATION MANUAL. DURING A FLIGHT THERE WAS ANOTHER PRESS AUTO FAIL MSG. WHILE TROUBLESHOOTING & INSPECTING, AN INSULATION BLANKET WAS FOUND STUCK IN THE OUTFLOW VALVE. NO DAMAGE TO THE VALVE. THE BLANKET WAS REMOVED & THE VALVE OPERATIONS TESTED SERVICEABLE IAW THE AMM 21-31-02 500. IT SEEMS THAT THE BLANKET WAS NOT PROPERLY SECURED AT THE END OF THE CHECK, SO THE MX PROVIDER WAS INFORMED TO PREVENT ANY RE-OCCURRENCE.