What was found
DURING INITIAL CLIMB, NR 2 ENGINE BLEED OVERHEAD LIGHT ILLUMINATED. BLEED SELECTED CLOSED. LIGHT STAYED ON. NR 2 ENGINE WAS THROTTLED BACK TO IDLE. LIGHT WENT OUT AFTER 5 MINUTES. NR 2 THROTTLE ADVANCED WITH NR 1 ENGINE AND NR 2 ENGINE BLEED. SELECTED CLOSED AND LEFT ISOLATION VALVE SELECTED CLOSED. DUCT PRESSURE LEFT WENT TO 60 PSI AND OVERHEAT LIGHT CAME BACK ON. RETURNED TO JFK. REMOVED AND REPLACED 3-WAY VALVE PER MM 76-34-02. IDLE RUN PERFORMED PER 71-00-00 TEST NR 3. OPS CHECK OK. (X)