Audio Int. Credenza PSU Switch Panel P/N: SPS-3-1-1757. 4ea Audio Int. Passenger Service Unit Switch Panel (PSU) P/N: SPS-4-1-1756. 4ea Audio Int. PSU Switch Panel (Master) P/N: SPS-4-1-1755. lea Audio Int. Vestibule Switch Panel P/N: SPS-6-1-1760. Wiring for the newly modified / installed Galley and Cabin ele