What was found
AT 11,000 FEET WE GOT A DUCT LEAK LIGHT. AFTER DOING QUICK REFERENCE HANDBOOK AND WAITING 3 MINUTES THE LIGHT REMAINED ON. BEFORE GETTING ENGINE SHUT DOWN THE LIGHT EXTINGUISHED. RETURNED TO SLC. REMOVED AND REPLACED DAMAGED FITTING TO INLET OF LEFT AIR PRESSURE REGULATOR PER EMB 120 MM 20-10-04. ALSO, REMOVED AND REPLACED LEFT PRESSURE REGULATOR VALVE PER EMB 120 MM 30-10-06. RAN LEFT ENGINE FOR 20 MINUTES HIGH POWER SETTING WITH PACKS ON. OPS CHECK GOOD WITH NO LEAKS NOTED.