As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 9001 - DEPARTING DAY, RIGHT AFTER TAKEOFF NR 1 ENGINE LOW OIL PRESSURE/OIL BYPASS LIGHT CAME ON. ENGINE OIL PRESSURE WAS SLIGHTLY BELOW GREEN BAND. CAPTAIN NOTED IRREGULAR NOISE DURING/AFTER TAKEOFF. AIRCRAFT CONDUCTED AN AIR TURN BACK TO DAY AND LANDED SAFELY. REMOVED NR 1 ENGIEN AND WILL SEND BACK TO MANUFACTOR FOR TEAR DOWN AND ANALYISIS. (M)