What was found
IMMEDIATELY AFTER TAKEOFF, FELT AND HEARD LOUD BANG TO AIRCRAFT WITH ASSOCIATED FUMES IN COCKPIT. INSTRUMENTS REMAINED NORMAL. AIRCRAFT RETURNED TO PHX AND MADE AN UNEVENTFUL LANDING. FOUND EVIDENCE OF BIRDSTRIKE TO NR 1 ENGINE INLET. PERFORMED BIRDSTRIKE INSPECTION. NO DAMAGE NOTED. REPLACED CSD OIL COOLER AND RIGHT WATER SEPARATOR BAG. PERFORMED ENGINE POWER ASSURANCE RUN. ALL PER BOEING M/M.