Ford Taurus Secondary Air Injection System Leak - Fault Code & Diagnosis

I'm not sure what the exact fault code was, but the technician cleared it too quickly. The diagnostic message indicated a leak in the secondary air injection system or similar issue. I've already replaced the relay for the pump and can confirm that air flow is present at startup. I also checked the factory-installed hoses connecting to each manifold, and they appear intact. Any suggestions on how to further diagnose or resolve this issue would be greatly appreciated.