As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT LEAK LIGHT ILLUMINATED ON RIGHT ENGINE. RETURNED TO FIELD. REMOVED AND REPLACED RIGHT PRESSURE REGULATOR VALVE IAW MM 30-10-00. RAN RIGHT ENGINE. PRESSURE REGULATOR VALVE OPS CHECKS NORMAL WITH NO LEAKS NOTED AND NO DUCT LEAK LIGHTS.