As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THE NR 2 ENGINE PNEUMATIC MANIFOLD FAILURE LIGHT ILLUMINATED. ACCOMPLISHED EMERGENCY PROCEDURES PER AOM VOL 1. GROUND MAINTENANCE TROUBLESHOT THE SYSTEM. PERFORMED MANIFOLD DETECTION TEST PER MM 36-23-00. TESTED WITH NO FAULTS FOUND. FOUND DETECTION CONTROLLER CANNON PLUG LOOSE. CLEANED AND SECURED CANNON PLUG. (X)