What was found
INSPECTION TYPE: N/A DIVERSION, LANDED WITHOUT INCIDENT. ANTI-ICE ENGINE 1 NAC VALVE NOT OPEN. REMOVED FAILED NACELLE ANTI-ICE PRESSURE SWITCH AND INSTALLED REPLACEMENT, REF A300 AMM 30-21-12-0401. COMPLETED OPERATIONAL TEST DURING ENGINE GROUND RUN, REF A300 AMM 30-21-00-0501, NO DEFECTS SEEN. ESR: P&W IPC 30-21-01 FIG2 ITEM 775.