What was found
MDW-PHX - FLT 577 - DURING CRUISE, THE RIGHT ENGINE WAS SHUTDOWN DUE TO LOW ENGINE PARAMETERS. CONTINUED TO DESTINATION WITHOUT FURTHER INCIDENT. FOUND THE P-1 AIR TUBE CHECK VALVE TO BE LOOSE AT FITTING. INSPECTED SAME FOR FRETTING AND CONTAMINATION, RESECURED FITTING, ENGINE RUN UP CHECKED OK. (M)