As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT, THE OIL PRESS INDICATOR NR 1 ENGINE, DROPPED TO 50 PSI. QRH DRILL COMPLETED, UNSCHEDULED LANDING COMPLETED. OIL PRESSURE REGULATOR ASSEMBLY REPLACED IAW AMM 71-01-50, SYSTEM TESTED SERVICEABLE AND AIRCRAFT RETURNED TO SERVICE. (TC NR 20070718001)