What was found
LEFT ENGINE AIR SUPPLY PRESSURE REGULATING AND SHUTOFF VALVE SUSPECTED OF POPPING CIRCUIT BREAKER. REPLACED LEFT ENGINE AIR SUPPLY PRESSURE REGULATING AND SHUTOFF VALVE. DID NOT HELP POPPING CIRCUIT BREAKER PROBLEM. REPEAT WRITE UP CB S11 ENG BLEED CONT POPPED. FOUND 2 WIRES APPROXIMATELY 8 INCHES FROM PRESS REGULATING VALVE CONTROLLER CHAFING AND SHORTNG. REPAIRED WIRES WITH ENVIRONMENTAL SPLICES, CB NOW OK. RAN ENGINE PER JRH, CHECKS OKAY.